It’s easy enough to delete one Facebook post at a time, but there’s no built in way to delete posts in batch. For that, you’ll need to turn to a browser extension.
I’m on Facebook and I’m deleting my stuff before I go. This makes it easier to batch delete.
Two alternatives I’m trying are Gab.ai and MeWe.com. Give them a try if you are on Facebook and are dissatisfied with the constant censorship and 30-day suspensions that I’ve been putting up with for the last year.