Unless you only want to do nonprofit/public agencies there is also a market for grant writing for small businesses. They are SBIR/STTR available from most (all

Unless you only want to do nonprofit/public agencies there is also a market for grant writing for small businesses. They are SBIR/STTR available from most (all?) grant funding agencies and are often how scientific startups get initial funding. Maybe these are considered not qualified candidates for your approach, but something to consider.