I am lucky I was able to give you what I did. Not a big video watcher. Sorry I couldn’t be more help. Have been meaning to get into RTS more but I have not actually played that many and have seen 0 videos about them, so I’m doubly unqualified to help you with that.

The YouTube algorithm is helpful to me because it knows I only click on gaming videos amongst a few other things. I just never ever clicked the annoying Person SLAMS Person outrage bait type stuff, and I also never clicked Not Interested on them (not sure if YouTube would actually listen, or if it would know by me bothering with “Not Interested” that topic pisses me off to see in recommends and thus it would conclude it ought to show it to me more), so it was forced to only show me the only stuff I engaged with at all: stuff I liked. So sometimes it feeds me nice niche gaming videos. I don’t watch frequently enough to exhaust its recommendations into being repeats of stuff I’ve already seen. It might (not sure) help that I also stuff gaming videos into my Watch Later playlist. This is what I did and I am not entirely sure it will work for you, but hey, it’s how I found literally all of these videos. Eventually sometimes it shows me cool stuff by the same person.