Make interesting videos. Make Vlogs of yourself.
Well, You can always try out YouTube's promoted videos feature, where your videos will show up on the right-hand side next to search results. All you do is pay some money, any amount will do, basically, and you'll be in business.
Other than that, try to make convincing(but not misleading) titles to your videos, and make sure you put appropriate and fitting tags on your videos, and also try to have a good thumb nail, which can be tricky.
You need new material. Nobody subscribes to people who shoot clips of video games with a camcorder pointed at the TV. If you want to be more popular, you need something to get people interested and keep them interested, so that word of mouth will make you popular over time. If you like capturing video game so much, you could get into Let's Plays. A Let's Play is like a play through a video game from beginning to end with commentary as you play. Another popular genre of videos is rants. I'm not sure if rants are your thing, but it seems to be popular. Those are a few suggestions.
Anyway, just look at other channels and try to discover how THEY get attention through their video content, then try doing something like they do. I don't know. It's really hard to coach someone on the intricacies of entertainment.