16 year user of reddit here, just create the communities you miss. With the massive influx of users, they will fill up quickly. It only took 1 day after I created lemmy.world/c/psvr for people to start posting content there. It feels to me like it will only take a few weeks before we can have some semblance of parity to reddit content. And it feels much more like pre-digg migration reddit to me, which is very much a good thing. I think the golden years for lemmy will be coming quite soon.