Different options:
One secure:
- click away all those outdated requests and delete the inactive members (about 50 haven't played in two years),
Two insecures:
- give ownership to another person and hope that the invites will be lost,
- delete the CC and start a new one with the 20something really active members.
The latter options may or may not solve your problems.
BTW: It's certainly not in your responsibility, but your CC is one of those which are shown in each and every country list of CCs - check Afghanistan, Andorra,....