My advice is, change your approach. Even women who don’t orgasm still usually feel pleasure, so I suspect you can too, just change your approach.
Since this is LDR D/s, which I typically would just recommend against to begin with because it has to be very hard to never have physical contact, but when you play, do things differently.
Buy different toys. If you use a lot of vibrating toys, go for something that is big and goes inside you. Make sure your G and clit are getting attention. If haven’t desensitized your clit with vibration, then a wand is pretty intense, as are vibrating Ben Wa balls, a bullet vibe on the clit, and or a plug. Suction dildos up against the bedpost can be very hot to fuck yourself up against while you talk to Mr LDR Dom on the phone.
Whatever you do, don’t do what you know doesn’t work.