It doesn’t really matter in which server you are on. You have to find people to follow to boost your experience. Search for hashtags you like and follow the people using them. There is no algoithm, you have to do this work in your own.

Danke für die Zusammenfassung!

I would not recommend acual deleting it. Save and delete all your data. Set a new very long password (they allow up to 128 char.). Then never use it again. This prevents impersonation. Nobody knows if/when your account nicht be available sometime after deleting it. Also, if you forget to change your e-mail adress you still have access.