People go inactive all the time for various reasons. You can start by messaging some of the members that are inactive and express your interest in wanting to game with them. More times than none real life events are what bring gamers away from the box, but you may get a few more active that way. You can always recruit new members. You don't have to clear out people to recruit new people. We will be here when those inactive folks get back. I suggest you just grab a few clan members and go out and find some new people you enjoy playing with, and if some of those inactive members come back then that's great to!