I had incredibly bad ADHD all through school. I got terrible grades but muddled my way through college basically through a combination of luck of and sheer determination not to fail out.

What finally helped me was bullet journaling + calendar.

I have about a million half-finished bullet journals...but who cares. They work while I can remember them and when shit starts to fall apart I revisit them.

More direct answer to your question:

1. Create list of things you want to accomplish
2. Order them in importance to you
3. For the top 5 items, break them down into sub-tasks that take about 3-4 hours
4. Throw them on a calendar and mark them to repeat weekly. Boom, every week you work on those items at the time you scheduled.

If you can't figure out number 3, the original task was too vague and you either A. sub-task one is "need more input from a mentor" or "find mentor and learn more" or "watch youtube videos to learn more about this" or B. it shouldn't be on your list at all.