Speaking as a sometime professional tech writer, your advice is good. The best way I know to get rapidly better at technical writing is to write a lot with ong

Speaking as a sometime professional tech writer, your advice is good. The best way I know to get rapidly better at technical writing is to write a lot with ongoing feedback from a capable professional editor. A good editor will teach you to catch and correct mistakes that you never knew were mistakes. Moreover, they'll teach you to understand why they're mistakes. Unfortunately, the opportunity to write with the support of a capable technical editor is hard to come by. If you aren't working as a tech writer in a professional publications department somewhere, it might never happen.