Good advice all around. I'd just add a few points.

Many writers would include a step between first draft and revision, called rewriting. Hemingway famously said, "The first draft of anything is crap." Rewriting need not mean starting over from scratch, but it does mean being ready and willing to rip out major chunks--whole chapters, plotlines, characters, etc.--add new chunks, reconsider POV, and reorder everything. It's re-visioning writ large, and it's equal measures of pain and excitement. And you often need to do it more than once.

The other thing I'd add is that there are more ways than ever now to make a decent living as a writer. Writing novels, sad to say, is not likely to pay your bills by itself unless you're lucky, but if you carve out a niche within a profitable genre (like romance or YA thrillers) and produce a book or two per year, you'll do quite well. But even poets can do well by going to a lot of conferences, giving workshops, and doing other activities that build their brand. And platforms like Medium demonstrate that there is money in producing short-form creative nonfiction.