That first "we already have someone" always feels like a door slamming, doesn't it? but honestly, it's usually just their polite way of saying "I wasn't ready for you." I'd definitely circle back to that first course once you've got a solid portfolio together - but don't ghost them for a month. aim for 2-3 weeks while their memory of you is still fresh.
before you do, put together a simple one-pager with 3-4 clear before/after examples. construction sites work brilliantly for this because the visual contrast is stark. Golf course managers think in pictures anyway, so let the images do the heavy lifting. Stick your contact details prominently at the bottom.
when you get the "we already have someone" next time, just acknowledge it and pivot naturally - ask what they currently use drone services for. Gets them talking, and you might uncover gaps their current provider isn't filling: irrigation monitoring, membership marketing footage, or even hole-by-hole flyovers for events.
also, booking a proper 15-minute slot instead of cold dropping makes a world of difference. email or call ahead, say you're offering complimentary aerial shots to a few local golf courses while you build your portfolio. Takes the pressure off both of you - feels like a favour, not a sales pitch.
what specific applications are you planning to lead with for the golf course market? Thinking more about course maintenance or member engagement?