I liked Tweeteraser for mass deleting. It has a free version and a more robust version for around 5 USD or so. Archiving your twitter is easy, you can do that through your settings on the website itself and it emails you when it's ready. I also agree w that other user, go private and camp
skybridge is a chromium/firefox extension that allows you to go to your followed page and find people who are also on bluesky. only downside is that you cannot select all at once.
Comments
And dont delete your account, or else people can claim your tag.