Moved to the scripts / ideas / planning forum.
the YouTube niche of gaming dying
I think the term "niche" is very misunderstood and gets used incorrectly on this forum. Probably the fault of many YouTube "gurus" who use the term incorrectly too. A niche is a
small sub-set of a large market. It's a specialisation into one very small part of a large market.
Examples away from YouTube. The restaurant business is a large market. It's an industry. If someone opened an organic, gluten-free restaurant. That would be a niche.
"Gaming" isn't a niche. "vlogs" aren't a niche. They are the large market. They are like the overall restaurant business. They are a full industry.
A niche would be a channel dedicated to "Games for the commodore 64, commentary in Spanish"
The whole point of having a niche (as per the correct definition) is that if you have done your research correctly, identifying a good niche would mean you have identified an area where there is hardly any competition, but still quite a bit of demand. Without a niche, you'd be trying to compete with the whole market and the little guy would have no chance against the bigger companies.
Coming back to the OP. Gaming isn't a niche. Even "overwatch gaming vids" isn't really a niche because it's a hugely popular game in a huge industry. Therefore "overwatch gaming vids on YouTube" is in itself an industry and has a huge amount of competition. A small channel starting out would have very little chance of getting noticed amongst the bigger channels. That's why you're not succeeding. Too much competition in a broad market. It's like opening an independent fast food restaurant in a city where there are already 5 McDonalds and 5 Burger Kings. You'd be more successful if you opened a sushi restarant.
You'd have to specialize further to make it into a niche. That could be concentrating on one particular aspect of the game andf making videos ONLY about that apsect. Or one particular style of video (montages, funny clips) Or if you spoke a foreign language, make commentary in tha language. Something that narrows it down into a specialization where there are fewer competitors, but there would still be an active market. Or choosing a totally different subject (less mainstream) altogether.