I'm trying to find out if there's any way to get more than 90 days retention for events.

It is not possible to have a retention period of longer than 90 days. Our retention period for all SaaS paid plans is maxed at 90 days.

Note: For organizations with an Enterprise contract it is possible to have a retention period shorter than 90 days. If you would like to know more about that plan please let us know here.