But if you have bigger ambitions -- you might actually have to talk to humans and look into this weird thing called "sales” and this other weird thing called “human relationships.”
Remember, a vast vast majority of money paid for software and value to be created solving problems with software comes from organizations (businesses, governments, etc). Not consumers or other indiehackers, which are the folks you'll find using the playbook OP mentioned above. Indiehackers might sound like a fun customer base, but be aware they are also the people who will loudly complain "THREE DOLLARS A MONTH FOR THIS??" when you do your show HN post.