If I remember correctly, back 5+ yrs ago there was a bit of a falling out with some top members. After that things kind of slowly slowed down. But yes compared to 10yrs ago or so it is dead. There use to been karma point betting & all kinds of stuff.
Two thoughts
1) You want more activity - be more active. Invite buddies over and have them post.
2) A few years back ALL forums were more active. Then along came facebook, Instagram and Whatsapp.