But I've probably learned the most from the raw, personal stuff I've written from the heart right before sharing it with the rest of the world on Medium or somewhere similar. Some of those lessons were joys to learn, while others were honestly pretty sobering. All of them were valuable.
Yours will be, too, if you're an aspiring writer -- especially at the point where your writing goes from vegetating in some obscure corner of the internet to actually being read and shared. Yes, it's what writers think they want, and it can be pretty darned great when it happens, but some unexpected insights come with it, as well. The following are good examples.
1. What Your Readers Actually Want to See from You
If you're lucky, there might be some overlap between that and what you personally enjoy writing, but I wouldn't hold my breath. You also might find that what readers want to see from you isn't the same as what they want to see from Jim Bob or Jane Doe. That means you're probably not going to have much luck copying another writer's exact trajectory from relative obscurity to success. I don't care what they promised you in that expensive course they sold you.
Some niches just plain have a broader appeal than others. Whether they admit it or not, most people want to be richer, better, more talented, or more attractive. They want better relationships, a stronger sense of self, and a more prosperous life, as well, so those will always be good topics to write about if you want to be read. But the image you project will have a lot to do with how well you do.