If you want to play against good players you need some games to gain rating
When registering pick an elo. Provide a proof that you own the account in that Elo range and then you can create another account that will start in that Elo range.
So you get ONE pseudonym and then any other account you create are known aliases of that pseudonym.
And if you play in person, then any account/pseudonym you ever create are linked to your human identity as well.
Otherwise you can remain pseudonymous (not anonymous) for as long as you want.
But there is no way to do a mix of in-person and pseudonymous writing/chess/art/anything with a personal “style”.