Keep researching coping mechanisms and asking for help if you can, because even if something doesn't work or only worked for a short while, there is plenty more coping mechanisms out there to help you

My biggest coping mechanisms was creating a space for everything, so that I could put something away and not create a mess in my room. I also like to use a big calendar of some sort, it allows me to see what things I need to do that day but also what I need to do that week so I can prepare in time, though a smaller planner can do that too if you prefer that. Try to find community to see how other people cope. I know someone on tiktok uses task bracelets to remind them what they have to do that day and when they're done with the task they can take off one bracelet and put it back in the jar. Or discord is where I've found a lot of people with similar struggles to me and they have all kinds of great tips and help me get over executive dysfunction by keeping me in check when I ask them to check up on me