Should I separate research into professional and "citizen science" or amateur?
Your broader question seems to be whether you are "truly" a professional researcher given that you are paid to do research but consider your research skills to be far below some of your peers. I suspect this is entirely opinion-based: there is no hard-and-fast definition for the term "professional researcher."

The specific question seems to be whether you should identify yourself as academia, corporate/government/NGO, or citizen science. Given that you are requesting access to this website as part of your official corporate portfolio, I would say that corporate/government/NGO seems like the best choice.