Gamechanger for me was automation with home assistant. I attached sensors everywhere and wrote scripts that nag me with notifications on my phone. For example I have a smart wall plug where the washer is attached to. If the power draw first rises over a threshold it means, that I started the washer. If it goes below a theeshold that means it's finished and it sends a notification. To make sure I don't ignore it, I attached a door/window sensor to the washer's door. So it reminds me every 5 minutes until I open that fucking door.

And I tried to identify as many situations like these as possible so it takes care of reminding me. It's not perfect and many things are not feasible to automate. But it helps me a lot!

This. As someone with severe combined type ADHD, it is vitally important to develop coping strategies. Timers, alarms, calendar entries, etc. Anything and everything that works. I also recommend passing your decision making process through a mental prioritization framework so you target the lowest hanging fruit (choose biggest impact tasks that require the least amount of effort to complete).

I really have to do that. I set my alarm when i start my washer. Even tho my room is next to it and i hear the beeping.