Having worked in government contracting for most of my career, I can understand the appeal (and difficulty) of selling B2G. One of the fastest paths is through competitive solicitations that are posted on sites like FedBizOps (https://www.fbo.gov/). The registration and submission process can seem tedious so give yourself plenty of time to complete those steps. Also, follow the submission guidelines EXACTLY. They will disqualify proposals for technicalities. But if you're willing to put up with the red tape, this is one of the fastest ways to sell into our government.