I see you have a 9 year old VW with 170K miles. Detail it (should already be), go to a car show. Park so people can see your car, find a nice car with swirls and other paint defects. Park next to it.
Walk around, talk to other car folk and be friendly. Find the ones who are enthusiasts and love thier cars. Find thier weak points, swirls, buffer trails, scratches, swirled wheels, faded trim. Speak to them about it, mention you are a detailer. Walk them to your 9 year old, 170K car that is not a garage queen. Show them how amazing your paint, trim, interior and wheels look. Explain to them the process and how you can get them there. Try to book on the spot, offer to show a 50/50 test spot by stopping by your shop.
There that first tip is on me, good luck.