Worth amplifying this point yet again. Please do NOT delete your #Twitter account. Even if you stop using it completely, please don't increase the risk of your user name being reused by someone else in the future. And I strongly recommend downloading all your Twitter data now, while Elon still permits it and the relevant systems are functioning. When I did this a number of days ago, it took ~48 hours from the time I made the request to being able to download the data. That's liable to get longer as more people request the data.

Go to your Twitter profile, then:

More->Settings and Support->Settings and privacy->Download an archive of your data

For now, I recommend using email verification and not text messages (SMS) to confirm the download request, since there have been reports of Twitter SMS failures lately, but it's up to you of course.