In our case, one of our team members is leaving the team. He is also the main admin of pagure repositories for our projects. Since he will not be much involved with these projects anymore it makes sense to shift the main admin role to someone else in the team, but Pagure does not seem to have this option for now.
At the bottom of the settings page for the project, that person can "give" the project to someone else, which is basically granting someone else the "main admin" badge.
Thanks a lot for the quick response. You can close this issue as invalid.
Done :)
Metadata Update from @pingou: - Issue close_status updated to: Invalid