Good morning @mel,
Somehow I never saw your post when it was first posted either (very likely due to my own ADHD!) I’m sure by now you have found things that work for you, here’s a few ideas that have worked for me, (just in case you’re still struggling, or if you just need validation that somebody else is also doing what you’re doing.
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As an ADHDer I do love my lists!! And I definitely know how challenging it is to find lists and apps and that actually help. I started using asana for work, and it has been pretty useful. I’d like to use it more for personal projects and to do’s and I have set up a second free workspace for myself for personal use. (My challenge is switching between the two, but fortunately I can at least have two windows open on my desktop, or I can always just have my personal space open on my iPad or phone.)
1) SUBTASKS. I often find it difficult when my to do lists get very long and it all becomes very overwhelming. It’s helpful for me to use subtasks to break things into smaller steps (as small as you need them to be) which makes those bigger tasks less daunting. Then you still get the satisfaction of ticking the check marks along the way to completing those bigger tasks. (I can’t be the only one who creates smaller steps just for the dopamine boost of a few extra flying narwhals upon task completion.
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I also like that subtasks collapse up into the parent task and then your side bar is a little less visually overwhelming. While I do realize I’m very out of sight out of mind, leaving the parent task there with the subtask icon reminds me there’s more details to attend to.
(Also with regards to hiding your photos, files etc., if they are nested in sub tasks i’m pretty sure they won’t show on your main project boards.)
2) DUE DATES. I also have a very hard time prioritizing, (since I often find myself procrastinating and continually changing the dates.) But I do find due dates very helpful. I have rules that automatically move tasks to certain sections based on those due dates. For instance, in my tasks I have a section for today, tomorrow, this week, next week and a few sections for specific task categories. I have rules running that when the due date is 1 day away it moves automatically to the “tomorrow” section, and when the due date is today the task automatically moves to the “today” section. This means I just tackle one day’s tasks at a time, and if I get extra time or finish those then I can look at other sections. This is why it is extremely helpful to use those due dates and rules especially if I’ve created a task and stashed it somewhere, then completely forget it exists.
3) SEARCH/ADVANCED SEARCH. If you don’t want to assign every task to yourself, the search function is super helpful since searches across all of your projects whether assigned or not. This helps keep your my tasks a little less cluttered. (You just have to remember you have tasks elsewhere besides just my tasks.)
4) EMOJIS. To make urgent or related tasks stand out more I use icons/emojis at the beginning or end of my task name, like 
etc. (Since my computer doesn’t have these emojis I usually end up adding them from my mobile devices.) But don’t use emojis too much or with every task, as that gets just as cluttered and then nothing actually stands out.
5) RECURRING TASKS. I use recurring tasks especially to remind myself of my daily routine. Part of that routine is “HOUSEKEEPING,” where I go through my task lists, decluttering and eliminating duplicate or redundant tasks. Since I often think of things which I think are brilliant, and find out later that I’ve already added them previously.
(SET A TIMER for this though, otherwise you spent half the day just re-organizing your lists.)
6) TIMERS. Since I get hyper focused and have complete time blindness, I set 30 minute timers. This at least gives me an alert that time has passed, and if possible I try to move to a different task that also needs attention. I use caution with this though because I still need to go back and complete that task.
Sorry, I realize there is a crap ton of information in this post. But you can probably relate to the need to overshare and give your whole life story in one go. I’m sure I’ll think of plenty more later. Again these are just some things that seem to work for me, hopefully it is helpful to you or someone else that might be reading my rambling.
Anyway take care, be safe and make good choices!
Oh and P.S. just in case you haven’t discovered noise canceling headphones yet, they are absolutely a game changer! For work, out shopping, or in over stimulating public places. (I turn on a “stay aware” function where I can still hear necessary sounds like traffic, or if somebody is directly talking to me etc.)
