I ran a few video game websites. Honestly, I wouldn't do it. There is way too much competition and you'll be spending years of your life to just get okay web traffic. Plus the income sucks unless you know what you're doing.
But if you've already started, I would focus on FPS (Halo, Call of Duty, Star Wars Battlefront, Battlefield) and open world games (Witcher, Elder Scrolls, Fallout, GTA).
The reason why I say this is because those genres are very popular. They aren't going anywhere anytime soon. And the games are so large and have such a long shelf life that you can write about them for a long time.
Focus on writing the best content about each game and not trying to write about every game or your website will be all over the place.
Hello. Can you please give me advice what is the topic of a games world that you are most interested in? I have and still working on A Video Game Genres Site about games and i would love to hear what would be the top story or stories that I can write about? Thank you