Little wins. Start small and every little task gives a bit of a dopamine hit. Don't look at a task in its entirety, little steps at a time. Timer, work for five minutes, then take a break for one. Then work for another five minutes etc. I get bored trying to complete a task to entirety so I tend to jump from one thing to another. Stuff gets done. Not ideal but brain is so burnt out it's a wonder anything gets done. Start small and chip away. If you need a break, take it. Tackle what you think you can manage. Write down each thing you manage. Gives a bit of a boost when you see it down on paper. Have a treat, just something small to look forward to, for when you've tackled something or worked throughout the day on something. All the best.