A really good book is Style: Toward Clarity and Grace by Joseph M. Williams (https://www.amazon.com/Style-Clarity-Joseph-M-Williams/dp/02...), notable because it uses a lot of examples to move step by step through the process of improving and clarifying what you've written. Far too often people think the first draft has to be perfect, when in reality writing well is more like rewriting well.

I've read drafts from people who truly write well and have come to the conclusion that the biggest thing they're doing that I'm not is revising. I write straight through and maybe do a single pass after to punch things up and get rid of passive voice, and so everything I write reads like an HN comment (which, don't get me wrong, is a useful local optimum for me). The good writing I've watched happen was revised a lot. Besides not having the talent, I lack the patience, which is liberating.

Also: this book is great: https://www.amazon.com/Style-Clarity-Chicago-Writing-Publish...