In one year, I have gone from nothing to 1300 subs and a good revenue stream. I am by no means big, but I am growing fast and I am just an old guy with an action camera, videoing my daily activities. Let me give you some business advice that applies to all of life. You have two choices when you start any business, find a niche or do it better. Back in the 1990s, Yahoo and Microsoft Internet Explorer were considered unbeatable. Many tech analyst talked about whether anyone could even mount a challenge to these two monopolies that ruled the internet. Many tried and failed. One day a company named "Google" came along and did the exact same thing as Yahoo, but they did a it a lot better. Where is Yahoo now? The unbeatable giant is dead. Then Google made a better browser and guess what? Internet Explorer is dead as well.
So you can break into a market by doing the same thing, you just have to do it better then everyone else. This holds true for youtube, but it is going to be a lot harder, because you are not dealing with one company, you are dealing with millions of creators, all trying to do it better. So the best thing to do is to try to find your niche. This is not to say that there is nobody else out there doing what you want, but try to choose a less popular subject to focus on.
Take Video Gaming videos for instance. Every teenage boy with a computer and screen capture program thinks they can make it big posting videos of them playing video games and talking incoherently off the cuff. 80% of the people on this forum have a youtube channel dedicated to "Video Games", as if there was nothing else in life to be interested in. A good majority of them will go nowhere, but they will have a lot of fun winning at their videos games while they fail at being a youtube success. It's not that what they are doing is bad, it's just that they are in a over saturated market. Think about it like this. Say we were talking about burger joints and not video gaming channels. If you came into a new town to start a business and saw 40 burger joints right next door to each other, would you think it would be a good idea to build another burger joint next to the last one in line? Of course not. Now, if you built a TACO stand there and you would make a killing! Do you see what I am trying to get at?
What I am saying here is that, if you have a passion, but that passion is something that a million people are already doing on youtube; find something less popular to be passionate about if you want to make money on youtube. Or figure out how to do the same thing everyone else is doing, but do it a lot better. Those are the two choices.