Based on what you’ve said already it seems like you are focusing on depriving yourself dopamine. I don’t think that will help you get over the hump. Maybe in some cases because turning off WiFi sets a hard deadline in your brain but as you’ve already noticed it doesn’t work for regular stuff.
This may not work for you but it has been incredibly successful for me. It’s NSFW so bear that in mind: masturbation. I use masturbation as my go to activity to give myself that rush of dopamine and it has the added benefit of being a one and done activity. I got off so now I start my routine. It definitely hurts me in other areas and has a lot of social stigma associated with it but my adhd already cost me my marriage so at this point I’m sticking with what works. It has definitely kept me on track and is almost like a waypoint to jumpstart my daily routine.
If that’s not your cup of tea you just have to find what works. An activity that feeds you the dopamine you need to get started. I’ve heard dark chocolate can be good due to the caffeine so it’s like a double hit of dopamine.