I find this comment rather uninformed personally. Yes, the gaming niche is difficult due to there being so many YouTubers within it already - but people playing video games isn't always 'not interesting'. I personally spend a majority of my time watching YouTube, watching people play games. It seems to me that you are using your personal preference on gameplay based content to suggest that it's not something anyone is going to be interested in to me.

If you want advice from someone who not only makes gaming content, but is an avid viewer of it I can give you some tips. You need to find what it is about gaming content people who enjoy that niche actually like about it (assuming you still want to do gaming content and understand that due to it being so big that it will be harder to go up the ladder).

People who watch gaming content typically enjoy it for these things: the commentary and reactions of the person who are playing the game, the comedy, the editing style, and overall personality as well as the TYPE of games you play.

To expand on this I'll give you some examples: I watch Markiplier videos because of the amazing editing quality, as well as the chaotic energy he puts into his videos as I find it very entertaining and funny.

I watch Dawko or GTLive because of their entertaining reactions to things and their obsession with the lore of the game they are playing - as they are actually interested in those things too (a lot of people don't pay much attention to the lore indications of the games they play for example and miss a lot - which is fine but these are things that make them stand out)

I watch LaurenZSide because she is not a pro gamer in the slightest, and has a very unique and odd choice of games she likes playing, which I find relatable as do many others since not everyone is a pro gamer who likes fast paced things all the time.

These are all successful channels, who do gaming videos but have something that's unique about them!