1) For the forums, if someone suggests a good idea then that person should get a "Rep" point and the more rep points a person has then that person gets more privliges on the site.
2) Maybe a new layout change, have polls so people can vote for things that they like.
3) Have roles, like for example a new member of the site is a "recruit" and so on.
make something like a clan for players to join.exemple:dragon games(games with dragons),knight kindom(games with knigts)or The 3th Trylogi,for trylogi games(sorry if i spelled wrong,im brazilian)