You think you could never get paid the value you bring to the table because you are imagining delivering services to the kinds of companies who would think to look at freelance markets to find the going rate for building code in the platforms you work in.
But the world is full of businesses with absolutely no technical competence at all, and so much operational competence in their own field (health services, benefits consulting, reinsurance, whole animal butchering, whatever) that they could take over the world if someone anywhere would just notice the opportunity to scale their processes (lead gen, customer retention, supply chain, market expansion, franchising, customer service) with basic technology.
To many, maybe most of those businesses, just being able to throw together a Bootstrap/Rails app makes you some kind of terrifying Wizard. If you can get over the urge to talk like a Wizard, and apply the customer service aptitude taught to every new employee at Nordstroms, you would probably find it's nowhere nearly as hard to capture the value of your work as you think it is.
I'd also note: if you're incapable of convincing a tech-impaired local business to consider a value-priced engagement that will make or save them millions of dollars, you may have a hard time building your own company(ies). Maybe not, though! Totally possible to skip that step.