I would say there are plenty more, this is more of a shilling of these groups type of post, not saying these are bad ones because I do not know them and I can't say if they are good or bad, but I can say that there are many good ones outside of this list as well. You can find them yourself if you google it and you can find places with 400k+ members who are mostly active.

So, I would say the best way to pick which channels you should go to would be to find numbers and engagement, if a group has 100k+ members but only 200 messages a day, that is not really an active or good group, but if it has 1000 members yet 10k messages per day, that is a very good group. Best ones are the ones that has a lot of members AND a lot of chat during the day.