Hi Avinash!
Ezequiel here, solutions engineer at Bildug Data (Mixpanel Parter)
I have the same issue with one account a few months ago and there is 100% useful workaround for this problem.
One possible partial solution is creating another mixpanel project, sending to that new project the events needed to create the cohorts and start sending the extra cohorts from the new project. This is possible becuase the 60 recurring coohort cap is per project