I advise doing it yourself. They are incredibly easy to make if you just want a quick picture with a number slapped on it. Go find a picture you like of the game you are playing and do what needs to be done. It is a lot faster and effective than waiting for someone to do it for you.

Your channel is also rather small, so you have lots of time to practice doing it yourself before trying to make a massive impression on the community

What's the problem with doing them yourself? Just get print screen from your gameplay and add some stuff on it.

You don't have to be. You just need a picture and know how to use a text tool in Paint, or Photoshop.