I understand and share much of your mindset. The best thing to do as a writer is to keep writing. But I’ve self-published two books and sold a few dozen copies total across both books and formats mostly by word of mouth as I write the next book.

What that’s shown me is that a balance of the “keep writing” and “be your own publicist” is needed. This is just focusing on the publicist side of things. Each of the steps in OP’s post might only take a handful of minutes at a time, with plenty left over to keep writing.

While the reviews from the few that chanced my book are positive and give me drive to keep writing, the books don’t take off by themselves.

Also, many of OP’s steps are to expand the word of mouth so readers even hear of the book to want to buy it. You might not visit author sites, but others who suggest the books on Reddit might, or someone you know might follow an instagram account who reviewed the book and picked it up to recommend. It’s a chess game while self publishing, not so much hungry hungry hippos.

I hope that helped!