If you want to move your Mastodon account from one server to another, you can keep your follows and followers if you complete all the steps in this guide:
https://mstdn.social/@feditips/107939441820299376
By the way, don't delete your old account after the move, because it will redirect people to your new account and keep your old posts in existence. Your old posts will still have your old account's name, but when people click on them they'll see a message directing them to the new account.
@feditips Without having read the whole document.
What happens if / when the original instance would stop you are redirecting from?
Then your old posts would disappear :( as there's currently no way of transferring posts.