I think my acc was wrongly banned
You can try to contact the support
As with all games
Contact support and wait until they get in touch
Where do I do that
Is it really that hard to figure out how to contact support? Just search Google for "Fortnite Support" and you'll find it immediately. Why do you think your account was wrongfully banned? You have to know if the reason that is mentioned is true or not.
https://epicgames.helpshift.com/a/fortnite/?contact=1
but it takes a while to answer them… Consider about 10 thousands of such a ticket write xD