Step 1. Log in to Facebook and Access Settings:

Open Facebook and then the menu.
Click Settings & privacy. Hit Settings.

Step 2. Navigate to Accounts Center:

Under Settings, tap on Account Center.

Step 3. Access Account Ownership and Control:

Proceeding further, click Personal details and then choose "Account ownership and control."

Step 4. Initiate Deletion:

Moving ahead, click Deactivation or Deletion.
Choose your Facebook account that you’re willing to delete.
Tap on Delete Account and then Continue.

Read More : https://www.digihubexpert.com/how-to-delete-facebook-account/