Well this is how I do it
When I'm about to post song there's something called switch account or smth like that
I touch that and then I sign in with the alternative account I made
But to make a new account you touch the "create new account" thing when you're signing in

Thank you!
But how do you exactly make a new account? Sorry

So you create a new account
(With a made up email or not it doesn't matter)
Remember both accounts password!
And once you make the Alt account you're free to go and switch you just gotta put your info each time you switch

Uhh lemme try to explain