But the same used to happen in tech forums I used to be in long before I started what I am doing. Ultimately, it dies. People move on. They get busier or reach to a point they rather be a lurker than a participant. Unless there's something to bring back fresh crowd in the forum, forums eventually die. If one doesn't bring changes/improvements within a timeframe, everything collapses- like the older Nokia company who refused to switch over from Symbian and by the time they decided with windows which was med is already too late.
Also, Facebook groups seem convenient because its one sign in fits all, but its very disorganized and doesn't give the ability to people to search for solutions in the forums (though to be fair, a lot of people have become lazier now). Unfortunately, unlike the previous generation who started blogging only because they had a skillset to share in the form of writing/making content- now most bloggers start just any blog for SEO, getting things, participating in contents, edgy content to rely on click bait. Most blogs recycle and rewrite content.
Most newer bloggers now are either trashier or just plain toxic content makers. I've seen this trend as per people asking for reviews. Before, blogs which requested reviews had something to work on. Now? Most don't make sense. Most are recycled content with obviously paid content garbage. Who will even bother to read advertorials? We need quality in abundance. Forums will grow naturally. Some quality writers even quit blogging. Which is sad and discouraging to hear.