Yeah, this is why I have a physical calendar with stickers that I can place for tasks (they are called family calendars and have extra space to place pictograms and notes on each day of the months) and an app that notifies me of tasks to do at the same time (for any ADHD havers here, the app is called Habitica, it's the best app I've found for ADHD, try it out; it really helps).

If I blend one out completely that day, the other reminds me non-stop on my phone (post-its were not helping at all on their own and weren't precise enough compared to a family calendar). It helps with getting more tasks done than if I didn't use those tools at all (I am medicated, but I still struggle with not doing tasks when my motivation is very low, you all know how it is).