Probably!
We limit the number of nicknames per account to ensure that everyone can have a couple of identities not connected to each other - we understand that not everyone is out in the same way to all audiences - heck us (the pnouns.fyi team) have multiple pages each because we aren't out in the same way to everyone.
If it is safe to have the same nickname shared between pages, we suggest creating multiple categories and sub-pages, potentially password protected (feature coming soon).
If not, or if there's other reasons why you need extra nicknames, please let us know what's up! You can use our main support form or submit our dedicated Request Additional Nicknames form.