If you want to leave a team/account where you were invited to, you can reach out to admins of this team and ask them to remove you from the list of team members.
In case you are no longer in contact with team admins, feel free reach out to us at support@miro.com and let us know the name of the team you'd like to leave - we will do it for you manually on our side.
⚠️ If you created boards in that account, their ownership will be automatically transferred to the team admin. Move your boards to your account beforehand to continue working on them.