Do keep in mind both lemmy and kbin are in the alpha stages and both were relatively slow/calm before the whole reddit thing happened so the devs were caught by surprise.
Try out one of the kbin instances and see what you think. It has lemmy + kbin + mastodon integration. Some of the kbin instances are listed on here: https://kbin.pub/en
I just opened user registration on my kbin instance yesterday so it hasn't been added to the list yet, but feel free to try any of them!
This is shitty of them to do but this is what people have been trying to tell us since the dawn of the internet. Nothing on the internet is EVER truly deleted