There are multiple ways to withdraw your crypto into a fiat currency. The most popular option is using a centralized exchange.
Step 1: Find an exchange that works for you. Coinbase, Crypto.com, and Binance are all great options.
Step 2: Complete your KYC (can take a day or two)
Step 3: Deposit your crypto.
Step 4: Sell your crypto using Spot trading.
Step 5: Withdraw your fiat into your bank account.