Hello! You are in the early stages of your career, and you should take this time to experiment. I think doing some skits and stuff along with your gaming videos would be good and works so well for other gamers. The biggest advice I can give to you as far as content, is to play into your strengths. You have to figure out what you're good at, what you enjoying doing, and go with that. Making skits might be hard if you only have a webcam. But then again, if you think you have a personality that people can find entertaining and really funny then the tech you have doesn't matter. Something like Sam Tabor's "I can't Even" did really well with very limited tools. I would just say not to force it and let it naturally come to you as you come up with ideas. I would also say to find a gamer or youtuber you really enjoy and think you're similar to, and figure out what that person is doing right. Don't worry you'll find it. It just takes time.
On the tech side of things, I think you know what can be worked on. Definitely your lighting will help so much for your webcam video. You can buy pretty cheap Softboxes on amazon to help with that. Besides that, your quality will upgrade as you upgrade your equipment. Good Luck!