While I'm not super familiar with the gaming channel side, with the new YouTube algorithm it's a good idea to make sure you are staying true to your channel with Keywords and not driving traffic through unrelated Keywords. YouTube has really cracked down on this as many people were manipulating their videos and channels by using unrelated terms because they were popular.
If you have a specific game you focus on, include that in the your Keywords. Or if there is a specific style or topic you often cover like POV, Gaming Tips, Gaming Tutorials, How to complete specific challenges or quests, focus on keywords that include those things.