Twitter is like that part of town where City Hall just lets anyone open up a bar or a restaurant. It’s lively, and it’s where everyone hangs out, but you certainly don’t want to take the wrong side street late at night. Maybe you’re ready to leave Twitter, thanks to its continued censorship of unknown individuals and simultaneous encouragement of hate speech and lies by more famous people and organizations.
If you’re serious about ditching Twitter, then you probably want to delete your tweets. Twitter feeds off “engagement.” If you delete your tweets, you leave nothing to engage with (although their “content” has probably been mined clean already). If you delete your tweets, and change your Twitter bio to say you’ve quit, this sends a stronger message than just slipping out the side door. It also helps stop someone else from pretending to be you.