You can add another mod, and then step down to transfer ownership. If you want to still be a mod after that, the new owner will have to add you, or the admin of the instance the community is hosted on

Make a new account, transfer the community to the new account, in your original account leave the mod team, in the new account purge the account

This will remove the communities from your account, and not leave them with a fake moderator, they will be clearly abandoned