The problem is we just have too few people, which has always been a sort of tension within the chan communities. At the extreme opposite end you have the 4kanker: incredible amounts of posters to the point of boards being almost unusable, and almost every single last one of those posters are garbage. It's like explosive diarrhea in text form, with never a single thought out response.
Here we have the opposite problem, where there's so few of us that one thread will take literally months to even hit autosage and we still have threads up from early 2018, as opposed to the cancer where a thread dies in literally hours even if it's popular, and 15 minutes if it isn't. KC2017 was largely the result of US politics shitposting but it had been a long time coming and by the end was indistinguishable from vierkanal. I had completely stopped even using anything other than vidya threads by then.
All that being stated yeah you're right and one big problem I noticed is it often feels more like people talking past each other rather than having an actual discussion. Like in vidya it often feels like Russia will be talking about some obscure game or Magic again, while Australia is talking about flight sims.
But this lack of engagement is really just because it's so niche. Like i don't even play either of their interests, and a good number of people here don't play mine. This can be a good thing however as it exposes you to lots of new material.
The main problem is trying to get it so we don't have the absolute most mouth breather bydlo and retarded fucking boomers from 4kanker invading us. I haven't seen a problem with Slav bydlo but really the problem is the worst sort of shit is now endemic to the internet thanks to combination of phones and everything else. Vierkanal is quite literally mainstream normies and everyone worth hating you'd normally want off the internet and our biggest problem is the moment more than a few people find out about us they're the first to try and ruin this place. I wouldnt mind if we got a lot more people here but the moment it turns into another 4cancerous shitclone it's dead.