If you have forgotten your pattern or PIN to unlock your TCL phone, there are a few ways you can reset it. If you have an active Google account registered with your phone, you can use the Find My Device feature to remotely reset your device. If you don't have a Google account registered, or if Find My Device is not working, you can try resetting your phone through the recovery mode menu.
To access the recovery mode menu on most TCL phones, start by turning off the device. Then press and hold the Volume Up + Power buttons simultaneously until the recovery mode menu appears on the screen. Use the Volume Up and Down keys to navigate through the menu options, and select Wipe data/factory reset using the Power button. Confirm your selection by selecting Yes -- delete all user data. Once the reset is complete, reboot your device and set it up as new.
Keep in mind that performing a factory reset will delete all data stored on your phone's internal storage, so be sure to back up any important files before proceeding.