My friend started painting business. He spent like $10 per day on facebook ads and over few weeks was booked for next 5 months. Many painters do not need better websites, they get customers by reference based on a quality of their previous jobs. There are very few good painters and many households that need to be painted.

Once he realized he can get any amount of painting orders he want for few $, he wanted to hire painters to work for him. And there he found out, that it is super hard. Only bad paiters without good reference or some other issues were willing to work for him.

So I think, you picked wrong target. Generally if a website looks like a shit, and the business did not bancrupt already than the shit design is not a problem they would like to pay for to fix.

Someone here mentioned that crap website is actually good price/quality of paint job indicator.

There is similar pattern with cars. A plumber who drives 10 yeard old average car is much better welcomed than a plumber driving mercedes. The cheaper car, the better. Most people have no idea how much the service should cost, but they know if the worker is poor, his margin is low and that is what helps people to navigate in such decision making.

There is a database that payment providers share with each other. Once some of them put it into it, you are done. I have seen this, a website game, selling in game products was fine for years. Than paypal suddently banned the account for no reason, no explanation. Since than it was always the same scenario, every payment provider first started the process and at the later stage declined, without telling the reason. That company has also a problem with setting new bank accounts too.