Second, get some Linkedin/Facebook/Google ads running. Get some more people to your site. IMO, one of the biggest problems is having a small audience for feedback. If your conversion rate is say 1% then you barely have 1 user. So, go big or go home.
Third, I believe there will be tools out there to help with other stuff like c-corp etc.
Can you share some of the tools besides the stripe's atlas?
If you are wondering the landing is https://goandcall.me. Idea is to let you create the link or widged to your own phone and let your customers or visitors call you without any plugins or additional software. Just from the browser. As well as give you the ability to manage links and numbners different ways (activate\deactive, schedule, etc.)
https://www.myusacorporation.com/articles/us-bank-account-fo...
Google is the best for getting small(total market-wise), expensive amounts of highly motivated potential targeted traffic.