136 is still too small of a sample size to base any judgment on so it isn't really worth diving into your analytics yet. However, I didn't pick up last time that one of the games you're specializing in is FIFA. Soccer (or football as you guys across the pond call it) isn't popular here in the USA. Yes, yes, I know US soccer fans will try and disagree with me, but it isn't. It is less popular than ice hockey and that has barely been able to hang on here in the US. So if you will be doing a lot of soccer "Let's Play" videos, I would recommend releasing your videos the hour that kids get out of prison ... I mean school. By that I mean, if kids are released from school at 3:30 pm UK time, upload your videos at 3 pm or even 3:15. These days a lot of school kids watch YouTube videos on their smartphones on the bus or in mom's mini-van on the way home from school. And if you're monetized, use the scheduler so episodes are always released then. You want to always be at the top of their subscription page and to get the kids in a habit of expecting content from you then.
As an aside, I would also recommend you consider specializing in only one game genre. Most gamers like to play only one, a couple, or a few genres. Not all. If you're all over the gaming map, you will turn off gamers who are not into all the genres you play in. If your subscribers get too many videos about genres they have no interest in, they will unsubscribe. Don't give them a reason to unsubscribe. And if your next question is: Can you be successful by specializing in just one genre? The answer is definitely yes. Pewdiepie specializes in just horror.
As for which game genre should you specialize in, it should ONLY be the genre that you most love playing and have been playing the longest time. Don't just do what it most popular. Gaming video viewers expect you to have a passion for the games you play. While you can fake it for a while, eventually the truth will be revealed. Not only that but nothing kills a YouTube channel faster than a YouTuber doing videos that they don't have a passion for. Additionally, that passion will enable you to keep putting out videos.