I think that we all know what works and what doesn't work, but in order to avoid doing the work, we come up with fake stories about what works. How do you make progress? You stick with it.
There are other things that matter, of course, but the big one is whether or not you stick with it. I read a blog post once where a trainer was talking about the two types of people that go to the gym. There are the types that go inconsistently, constantly trying to figure out a better way to train, and then there are the guys who just show up and keep trying to increase the weight they move.
Technique and strategy matter, of course, but not as much as sticking to it. After all, sticking to it will refine your technique. You learn what works and what doesn't, and you course correct. Starting with the best possible technique won't get you to persist, but persisting will get you to good technique. That's why it's the most important thing.
One of my favorite gems online is this forum thread. Jonathan Hardesty posted in 2002, saying that he would draw one sketch a day and post it online. He stuck with it for eight years. At first his drawings were terrible and inconsistent. Some would look halfway decent, but others were disasters. He drew whatever he felt like, almost at random. No person would look at his early work and say, "This guy has artistic talent".