It's about scale and consistency. What a lot of people do (what I used to do) is upload 4-5 vids and expect to see a massive payday by the end of the week. When nothing happens or the vids get banned, etc. I'd give up and say "oh well, it's not a working method".
The right way to do it: Do the same exact thing, just do it every day. Do quality research and upload 4-5 videos PER DAY for at least a few weeks. Put the effort in and I guarantee you'll see results.
Don't expect immediate results and DO NOT treat it like a half-a**ed attempt because you have no confidence in yourself. The biggest reason you're going to fail is because you won't put in the effort that you and I both know you're capable of. The reason we don't is because when things fall apart, we can tell ourselves "well I wasn't even trying anyway". And they will fall apart because you didn't put in the effort to make them succeed. It's a shitty circle that took me some serious mistakes to break.
Dude is right though, a huge part is the niche. You need to have a degree of demand for that topic. Other than that it's all you buddy. Consistency and treating it seriously.