There are several reasons to remove old tweets. Yet, if you haven’t already, the window of opportunity to do so is swiftly closing. TweetDelete, TwitWipe, TweetDeleter, or any similar tool may let you delete your tweet history. There are a few subscription-based tweet-deleting services available. It may be prudent to postpone utilising a premium service until it is obvious if any of these applications will continue to run once the API changes take effect.
Mastodon is a great place to find mutuals.
Regardless of your Fediverse experience, now would be a great moment to locate all of your Twitter mutuals on Mastodon. Movetodon and Twitodon allow you to quickly discover recognised Mastodon accounts. Constructing your following graph on a new platform may be one of the most difficult aspects of getting started, so even if you’re not sure about moving, it’s not a terrible idea to take use of these tools while you still can.
