I struggle with these things a lot too :/
It brings me a lot of stress/shame.
The things that have helped me the most are:
1. Planner/task list - update daily and prioritize each item (A, B, C)- schedule the big tasks on specific days
2. Utilize my “good” productive times (which are rare) to the fullest- if I am on a roll, just keep going!
3. Ritalin lol 😆