Yeah, this is what I’ve found too unfortunately. Brute forcing yourself to do stuff only progresses you at a snails pace.
I’m waiting to get diagnosed but its still a few months off so I’m trying this for now…
I don’t think an app like cold turkey would work for me (don’t trust that I won’t disable it), but what I have managed to do in the past is dedicate a certain device to work tasks only, and also ban myself from using the internet in one certain room (I essentially tricked my brain to pretend that there was no WiFi there). I coukd focus way better in that room knowing that if I needed to use the internet, I’d first have to go all the way down the coridor.