Your social club account got banned, this means you can no longer on play that server.
Ban evading is not something we can’t and will not assist you with. You have to face the consequences for not obeying the rules and I’m pretty sure ban evading will not be appreciated by the server owners.
Also there are no “official FiveM servers”, all the servers are managed by a 3rd party.
Contact the server owners for an ban appeal.
If you are asking if GTA 5 bans effect fivem then they do not. And you do not need a fivem account to play fivem, simple download the client from fivem.net and then launch the exe in a folder. After it has installed, launch it again.
FiveM is does not have “official servers”. You have been banned from one of the community ran ones. These servers have their own “rules” and can ban people at their own discretion, this isn’t our problem.
So, you can contact the server owners and ask them to unban you (which is unlikely) or, just find another server to play on.