>>> the Instances:
mstdn.social
mas.to
inditoot.com
(I am not suggesting you that these are better than others, but simply reporting what some new users said)
STEP 2: Export your posts, followers and silenced users list and import them in the new account as explained here: https://blog.joinmastodon.org/2019/06/how-to-migrate-from-one-server-to-another/
If you need help on this, please contact admins and users of the Instances that you signed up. Please note that if obe of the two instances is using an old version of Mastodon software, this process can work only partially.