I half agree with Stomiks, but 'near top player' isn't a requirement.
Just get familiar with the game and be good enough to make interesting videos with the skill you have.
At the moment, gameplay isn't an option for you.
You can make videos related to the community, a player, a map, anything informative is a good start.
The easiest and least thought of at the moment, could be a video about the forums.
A weekly series showcasing the funniest Off-Topic threads?
Or visualising some of the most helpful G&R threads?
You can do a lot with what you have, as long as it isn't related to your skill.
Just remember that there are other aspects to making good content, such as editing, effort and personality.
- Good luck on your YouTube journey, I'm sure you'll do fine ( •̀ ω •́ )✧