-Try showing yourself in your videos. Sometimes keeping slightly anonymous can decrease the growth rate. People want to see who they are subscribed to
- when you reach your milestones, have giveaways
-tell people about you. Youtube is about promoting YOURSELF that is why it is YOUtube
-try to interact with your subscribers, reply to their comments even try to check their channels out and leaving a comment on their videos
-try to play trending games
-have commentaries in your games when you are playing. Don't just have moments if science
-edit your videos
-join form that specify in gaming
-collaborate with other people so that you can both kind of "share" subscribers. Their subscribers/viewers will come to you and your ones will go to them.
Tbh, fame doesn't always come fast. It needs time. Done expect it to come within a month it takes 2 years sometimes.