The first thing to do is to answer the question "what is it lacking". No one other than you (or your members) can tell you what your site needs.
I could say "you need a blogs add-on". But if you or your members have no inclination to write blogs then that's going to be a waste of time. Decide for yourself what your users need or want and then go from there.
If you are planing on offering a "clans" area for people to crate groups/clans and chat semi-privately among them, check one of the groups add-ons, FPS are popular for having clans or guilds with their own space