You cannot apply for citizenship with permanent residence status
Permanent residence status is no longer valid. If you had permanent residence status, you cannot use it to apply for citizenship.
If you’ve applied for citizenship and not had your ceremony
You’ll need permission to stay in the UK until you’re granted citizenship. Your permission needs to last until you have had your citizenship ceremony.
You might still be able to apply for settled status under the EU Settlement Scheme, if you have not already. This will give you permission to stay.
The deadline to apply to the EU Settlement Scheme for most people was 30 June 2021. You can still apply if you have ‘reasonable grounds’ for not being able to apply by the deadline.