You kind of have to think of this differently than you would on reddit. The fragmentation is to an extent the point. Maybe you talked about pcgaming on Reddit, 2 or 3 discords, 4chan, and Steam communities in your daily life already. If you miss out on a conversation in one place, that's unfortunate but not the end of the world. If its big enough news you'll see it in another community too.
Here you can talk about gaming in Kbin, Lemmy, Mastadon, Pixelfed etc. As your explore and your network grows, you'll get it all, possibly in the same feed. And possibly you don't care for the kbin pcgaming, you unsubscribe from it and perhaps a big strong community forms on Lemmy.world and thats where everyone goes but you're not subscribed? Someone will boost it your way eventually and you'll discover it too.