There are only three things I can suggest.
1. Make sure all games you play give you commercial use rights
2. Make sure also that you have step-by-step 'how to play' commentary throughout your videos (just doing incidental commentary LeafyIsHere style is no longer acceptable)
3. Don't use either the game's music soundtrack, or any other third party copyright music in your videos.
Of course, if things have gotten to the point that YouTube's decided it has enough monetized gaming channels, nothing you do will get you approved. If it comes to that, and you still want a monetized channel, you will need to change video type altogether.