I have this app where you can earn coins by watching ads, and compete tho be the first in the leaderboard.
activity_main:
<?xml version="1.0" encoding="utf-8"?>

<androidx.drawerlayout.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/drawer_layout"
    tools:context="com.HidiStudios.BeST.MainActivity">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context="com.HidiStudios.BeST.MainActivity">


        <TextView
            android:id="@+id/Coins"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="50sp"
            android:text="@string/coins_message"
            android:textAlignment="center"
            android:textSize="20sp"
            android:textStyle="bold|italic" />

        <Button
            android:id="@+id/resetButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/RewardedbtnAds"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="-25dp"
            android:backgroundTint="@android:color/transparent"
            android:shadowColor="@color/black"
            android:shadowRadius="20"
            android:text="@string/reset_coins"
            android:textSize="4pt" />

        <Button
            android:id="@+id/IntbtnAds"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:backgroundTint="#DB4437"
            android:shadowColor="@color/black"
            android:shadowRadius="40"
            android:text="@string/load_interstitial_ad" />

        <Button
            android:id="@+id/BannerbtnAds"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_above="@+id/IntbtnAds"
            android:layout_centerHorizontal="true"
            android:layout_margin="50sp"
            android:backgroundTint="#4285F4"
            android:shadowColor="@color/black"
            android:shadowRadius="40"
            android:text="@string/toggle_banner_ad" />

        <Button
            android:id="@+id/RewardedbtnAds"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/IntbtnAds"
            android:layout_centerHorizontal="true"
            android:layout_margin="50sp"
            android:backgroundTint="#F4B400"
            android:shadowColor="@color/black"
            android:shadowRadius="40"
            android:text="@string/show_rewarded_ad" />

        <com.google.android.gms.ads.AdView
            xmlns:ads="http://schemas.android.com/apk/res-auto"
            android:id="@+id/adView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_alignParentBottom="true"
            ads:adSize="BANNER"
            ads:adUnitId="@string/BANNER_AD_UNIT_ID">
        </com.google.android.gms.ads.AdView>

    </RelativeLayout>

    <com.google.android.material.navigation.NavigationView
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        app:headerLayout="@layout/header"
        app:menu="@menu/main_menu"
        android:id="@+id/nav_view"
        android:layout_gravity="start"
        />

</androidx.drawerlayout.widget.DrawerLayout>

Main Menu:
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <group android:checkableBehavior="single">
        <item android:id="@+id/home"
            android:icon="@drawable/baseline_home_24"
            android:title="Home"
            />
        <item android:id="@+id/leaderboard"
            android:icon="@drawable/baseline_leaderboard_24"
            android:title="Leaderboard"
            />
        <item android:id="@+id/gallery"
            android:icon="@drawable/baseline_image_24"
            android:title="Gallery"
            />
    </group>
    <item android:title="Profile">
        <menu>
            <group android:checkableBehavior="single">
                <item android:id="@+id/about"
                    android:icon="@drawable/baseline_account_circle_24"
                    android:title="About"
                    />
                <item android:id="@+id/login"
                    android:icon="@drawable/baseline_login_24"
                    android:title="Log in"
                    />

            </group>
        </menu>
    </item>

    <item android:title="Communication">
        <menu>
            <group android:checkableBehavior="single">
                <item android:id="@+id/share"
                    android:icon="@drawable/baseline_share_24"
                    android:title="Share"
                    />
                <item android:id="@+id/rate_us"
                    android:icon="@drawable/baseline_sentiment_very_satisfied_24"
                    android:title="Rate us"
                    />

            </group>
        </menu>
    </item>

</menu>

Activity leaderboard:
<?xml version="1.0" encoding="utf-8"?>

<androidx.drawerlayout.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/drawer_layout"
    tools:context="com.HidiStudios.BeST.MainActivity">

    <RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.HidiStudios.BeST.MainActivity">

        <TextView
        android:id="@+id/leaderboardTitle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="50dp"
        android:text="Leaderboard"
        android:textAlignment="center"
        android:textSize="24sp"
        android:textStyle="bold" />

        <LinearLayout
        android:id="@+id/leaderboardLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/leaderboardTitle"
        android:layout_marginTop="20dp"
        android:orientation="vertical"
        android:gravity="center_horizontal">


    </LinearLayout>
        <com.google.android.gms.ads.AdView
            xmlns:ads="http://schemas.android.com/apk/res-auto"
            android:id="@+id/adView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_alignParentBottom="true"
            ads:adSize="BANNER"
            ads:adUnitId="@string/BANNER_AD_UNIT_ID">
        </com.google.android.gms.ads.AdView>

    </RelativeLayout>

    <com.google.android.material.navigation.NavigationView
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        app:headerLayout="@layout/header"
        app:menu="@menu/main_menu"
        android:id="@+id/nav_view"
        android:layout_gravity="start"
        />

</androidx.drawerlayout.widget.DrawerLayout>


I don't think it has the best front end and design. Can you please recommend me design ideas, and any ideas related to a better application structure, if you think there are any?