Best tip I can give you, don't limit yourself to just gaming, let yourself get creative, make whatever you want, yes it is true your channel should have a focus in a specific genre of videos for the best audience retention, however from time to time upload something experimental for example, obviously by my name I have a gaming channel, but I'd say around 50 of my videos aren't gaming videos, I have a music video, an animation, a few different skits, some random "how to" joke videos, a video reading fake reviews and making fun of them, and quite a few vlogs, etc. and honestly when I upload non gaming content it usually ends up with more views then some of my gaming videos, as it's more original content, but I think the main purpose of making experimental videos is just letting your creative side work, once you get that creative energy going its really easy to keep making videos. And honestly when you make something you aren't used to making it makes your learn, increasing your creative skills. Honestly when you think about making a video don't just think of what game to play, just think about what your in the mood to do, what would be fun, and then just figure out how to turn that into a good video.
