Crossbill
To try to reactivate your account, you can log in at
https://account.riseup.net. If you can log in successfully, your
account has been reactivated. If not, chances are it has been deleted.
If that is the case, sadly there is nothing we can do for you.
If
you cannot log into your account anymore and used to have a valid
Riseup account, chances are your account has been deactivated. After a
certain amount of time, inactive accounts are disabled. Eventually, if
it is not reactivated, the account is deleted. Deleted account names are
kept in a reserved names list and won't be available again.