I'm not too familiar with the gaming space so my feedback will only be so useful, but it seems to me that people just aren't finding your videos for whatever reason. The number of uploads is impressive and the video lengths are good; Thumbnails aren't bad either. Again, I don't know the space too well but I'm guessing that maybe the games/topics you're covering are either too niche or too competitive to stand out? If I were you I would experiment with more ways to broaden your audience, which it seems like perhaps you're doing already; if you can find a unique twist to take on a popular topic perhaps you can get more people to discover your channel. I would also recommend using something like TubeBuddy to optimize your tags.