Updating the theme semi regularly (every month maybe, maybe longer) would keep things fresh
Also maybe some sort of creative collaboration. There was the million dollar band discord a while ago for example. Even a small e-publication where submissions are put on this site could be cool, would encourage activity.
Community events... e.g. maybe a watch-along of videos / movies etc etc... Not necessarily that but some kind of time where ppl get online
There are many more similar ideas which could encourage activity. There's plenty of real users registered, if we could get ppl back visiting & partaking in things it would be good... Plenty of people still use the bombstrap subreddit but the few times I've been on it, it seems kind of lame, like r/MDE after the Charls post got to the front-page. Lots of Twitter reposts for karma, stuff like that.. so not sure if we wanted new ppl that that would be a good place to go.
Either way I think trying any of the above could be cool. I can't code for shit so wouldn't be able to help with CSS stuff I'm afraid.