I think there is space to autonomy in blowing up, you just can't do anything to absolutely guarantee it. I know I'm sitting here as a YTer with 76 subs saying this so I'm hardly anyone to offer advice here, especially since my progress has been at an absolute crawl, but I think that the important elements are:
- Content polished enough for your target audience ('polish' can mean a lot of different things here, but at the end of the day, the content has to be 'right', if that makes sense?)
- Getting it seen by as many people as possible (this can be a tricky bit since so many people are clamouring for attention, but I think it can be done. This could be unpacked such a long way and probably far more eloquently by someone more experienced than me)
- Sooner or later the number of random people who see your content will include somebody who has the influence to rapidly snowball your content.
So ultimately, it's about making the best content you can and then playing the numbers game.