Pft, you got me. I'm still figuring it out.
The thing I know is important but I'm very bad at is the concept of pumping out content. People want to see your channel is constantly active. They want to open Youtube and have something new in their feed right away. That means that in between your more involved content-- things you're proud of but take significant effort and time-- you need to fill time with easier to create content-- like let's plays, short skits, instructional videos, etc.
I haven't gotten to that point yet because I focus on the very involved full episodes, and my brother was supposed to be doing the in-between stuff. He hasn't, and I haven't, so our channel is growing only by word of mouth and people willing to wait for episodes. Once I invest in my own recording studio, that will change. I'll be in there almost every day doing something. Even if it's not my proudest work, if people click on it, it served its purpose.