As said above, you can ask any moderator to whitelist your account but it's less likely to happen
Did the previous admin or staff help other users with the same problem? If this is not the case, maybe the OP could use his current (unblocked) account as a last option.This is how it looks like when someone used to register from IP which is having evil scores
Where it is mentioned that forum staff can whitelist you but there are no criteria was mentioned for that so it all depends but not sure it happened or not.