Try focusing on what you want to play, as long as you are unique you will be sure to grow, you can also try things that are popular right like Battlefield 1, minecraft...
Don't think about what's trending will get you views, because trending topics also have higher competition.
The better you play the more you can display your skills and be informative, which in-turn will gain viewers and your channel will eventually get subscribers..
play a game that you fill fully trust in yourself to do great then show a game that you have never try and show people your skills on that game but remember to have fun while doing both