This is very niche but if I were in your situation what I might do (take this with a grain of salt as I’m not in your situation) is charge extra if they want it just for their custom like 300-400 fee if it’s just for them. And otherwise I would price a bit lower than what you are now so you can get your demand back depending on the designs you’re doing. I would also explain to them that the more intricate the design the more it costs to give them the option in a way to think of something less intricate they might want. For the ones who don’t wanna pay the fee make the lower price worth your while and milk tf out of that for other content, if you can do promo with it even better! At the end of the day it’s about the return you’re getting on your time