In addition to what Likuu already stated above ,
Running a group / pack takes a LOT of time and especially patience. Around this time , people are usually heading back to school and their schedules might make them a bit inactive.
Giving a high rank to most qualified members is a good idea. These should be people that will be mostly active and that you can trust completely.
Maybe changing up how things run a bit? New rules & guidelines perhaps? Try and make it work for everyone and have them understand what the situation is going to be like while you're away and such. Maybe they're just as busy as you are and finding the right time for everyone to meet wouldn't hurt either.
Just keep trying friend, I'm sure once the summer hits ( Hopefully more people will be active too ) a lot of people might be rolling back in and the activeness will be up and running once more. ^^
Good Luck ~!