Board Thread:Support Requests - Community Management/@comment-25058183-20200817195718/@comment-25358237-20200817233709

If you are not active on a wiki that you are a bureaucrat for 60 days or longer, a user has the right to adopt the wiki. You cannot have this revoked if you later decide to return to the wiki when your permissions are removed. You could try asking the new bureaucrat for rights - but you were inactive when the requester made the request, therefore meaning that they could adopt the wiki.

A wiki does not belong to a certain person. It's likely that they won't give you back your rights for the reason of that you founded the wiki and want to return to it.