If you no longer have admin rights on your team blog, please consult the other members of the blog. Any other admin member can restore your access via the Settings | Basics tab in Blogger. If you’ve been removed from the team entirely, they can also send you a new invitation to rejoin.
The last admin member on a team blog can’t be removed, and can’t have their admin rights removed. That means there’s always at least one admin member on any blog, and that person can help out the other members. Please note that Blogger is unable to mediate disputes over team membership.