This is definitely a huge market. Are you targeting React developers only? I've successfully used html2pdf in the past, but looking again at their Github, it seems there has been no update in the last three years.
I think SOC2 is a must to start engaging with companies. Most PDFs will have sensitive data, and not many companies will feel comfortable sending customer data to a 3rd party platform, so you need security measures and certifications.
We actually take HTML as an input to our API converter. The React tooling is mostly to ease the barrier with most frontend codebases, as well as leverage the existing ecosystem of components.
It seems that these conversion engines are massive pieces of work that require a lot of upkeep, partly because CSS is a living spec but also because of the sheer number of edge cases.
We are already working on SOC2 as this has been a recurring ask, and indeed documents almost always contain PII.
I think SOC2 is a must to start engaging with companies. Most PDFs will have sensitive data, and not many companies will feel comfortable sending customer data to a 3rd party platform, so you need security measures and certifications.
Good luck!