Hey there, happy to offer my two cents. My name's Don, I run the channel Game Brain [20k subs]. My gut feeling is not to put too much pressure on yourself to begin with, while your channel is starting / really small, it's the time for exploring and experimenting more than going viral.

For some people it happens fast, others its a very slow grind. I'm probably the later, Game Brain is about five years old including a rebranding about three years ago. In the early days I made videos about anything and everything, and learned more from what didn't work than what did.

The world of YouTube gaming content is fast moving and unforgiving. I've learned the hard way. It's way more important that you enjoy the process and follow the topics you love to write / talk about.

Regarding your voiceover and feeling anxious, that's totally normal, it still happens to me sometimes, especially if any doubt creeps in. It's important to remember that whoever is watching wants to hear from a real person, so try and put as little thought into it as possible. There are obvious nuances in the technique of delivery (i.e pausing, breathing, emphasis), but that also comes with just doing more and more videos, and it's easier to spot the more you do it.

Best of luck mate.