I’ve been PI on a number of SBIR and other us government funded R&D projects. In my experience, the way to win an award is to market the idea to a potential govt sponsor. Sell them on your solution and then try to get them to write a public solicitation the general specs and requirements that exactly match what you have/want to do. It doesn’t guarantee funding, but is way higher chance than just responding to a solicitation you just happened upon.