I create game videos for F2P games, and what I've found really useful are three things:
*Go to forums! There are always places for video makers to present their work, at almost any game. You shouldn't just visit the forums for 'marketing' tho. If you want good results, then you should become active in a community at all. I'm getting pretty good views from posting videos at the official game forum from time to time, or at least when it fits.
*Promote your videos/channel ingame! I assume that you are hanging out with friends or a clan sometimes. Tell them that you have a YouTube channel - maybe they will take a look. If they like your content, then they will share it. I wouldn't spam in-game chats tho: This will cause you to get a pretty bad image in the specific community, at least that's what I've noticed so far.
*Create a blog/whatever that fits your gaming theme; add social media. I've done this before: I created a news blog about my game (you know, in F2P you can always post something about updates). There, I post 'regular' content most of the times, but sometimes I spread a video of me. That results in more views through Google searches and your followers will take a look at your videos. Contra of this is that it will take a lot of time, and you will need some writing skills for sure.
I don't know what your targets are, tho. I get ~100 views for every of these tactics, but my target community is quite small in general.