it's not about what you are doing wrong, it's more about the genre of videos you wanted to make.
gaming is very competitive because many people do it. you have to try to do something that pops out and makes you different from others.
1- a content creator should not expect to get famous instantly.
2- try to connect with your subscribers, ignore the haters and focus on the people who like you. also open a twitter to keep them updated and to ask them what they want to see next.
3- there are forms that are specially made for gamers.
4- to make yourself pop out, try out games that some poeople havent tried yet. if every one plays the same game it gets boring
5- to make yourself different from the others, SHow Your Face. behind the camera, it hides who you art. for me all the gamers look the same unless they show themselves or try to have an exciting tone in their voice
5- have a scedual
6- have a show, for examle on sundays it's minecraft, on wednesdays is Tome raider, on mondays you talk to your audience. but try not to over do it and post everyday
humm.. hope this had helped you
Welcome your subscribers and become friends with them, really it makes the journey a lot more funny 
