What can I do to improve?

I have recently had a couple videos blow up (compared to my other videos lol nothing impressive as a whole) as soon as I post them, have fair view duration (50%) and CTR (my understanding is that 3-10% is generally the norm) then YT just halted impressions. I’m vaguely familiar with “seed audience” I just need some clarification on how that all works. Does YT show it sample audience, sample audience likes it, YT pushes it out and it doesn’t do as well on the rest of YT. Or does YT pushes it to the sample audience, they like it, then YT doesn’t really do much with that video but remembers the audience metrics and eventually you get freed to all of YT with a tailored audience. If it’s the former then should I assume that my content is too niche or some other reason and I should change it a bit? (Additional context I made a few videos that both weren’t very good and slightly different topics within the same broader topic from the two recent ones that did much better. The content is WoW gold farming so it’s not something I expected to be wildly successful I just want to understand so I can do better) I can’t see how to post screenshots atm I’ll try in the comments