I recently "quit" Twitter myself. I say "quit" because if you actually delete/remove/whatever your account, your handle may then become available for others to use. To avoid that, I used a combo of scripts/services to remove all of my Twitter data (tweets, likes, follows, etc.) and scrubbed my bio, profile pics, etc. I also set a reminder to log in every 6 months to avoid being purged and have my handle become available that way.

I'm using https://fraidyc.at/ in Firefox to follow any Twitter accounts I still care about and it works great, even better than Twitter honestly as all tweets are now chronological and I can segment accounts based on how often I care to view their updates, tag them to organize them, etc. Next, I need to move all my YouTube subscriptions to Fraidycat or similar, but, other than that, I'm done with modern social media (deleted Facebook in 2016). YMMV, but the less I use modern social media the more my quality of life and mental well-being have improved.

I say "modern" since social media has really been around since email and it's really only the more recent incarnations that have gotten so toxic. Communities like HN and some sub-Reddits are actually still quite enjoyable.