> Could you give me a mental model or framing, different from the one I have, so I can think differently about self promotion on online forums? I would really like to put myself out there but my internal objections inhibit any action on my part.

One framing might be that you'd actually be helping people. You note that your product "can solve their problem." They're the ones on the forum talking about the problem, and you have a solution. You've worked hard to develop the solution and make sure it will do the job at a fair price. A person looking for a solution to that problem would not only be happy to hear about it but to give you money for it.