I divide my activities into two categories-Cognitive and Physical.
Cognitive: word/number puzzles, paying bills, reconciling the bank account, reviewing the 'to-do' list, planning my day/week, emotional therapy, learning a new task, trip planning & packing, legal affairs, medical bills & appointments, driving someplace new, airports
Physical: ADL's (activities of daily living-meals, hygiene, dressing, walking), errands, gardening, grocery shopping & cooking, doing laundry, vacuuming, making the bed, washing-drying-styling my hair (yes, that gets me out of breath!), stairs, airports, social gatherings.

My "allowance" to spend is 2 hours of each per day, that's it, no more, done. In addition, 8-10 cups of water per day. When I stay within my limits, I can avoid that horrible crash the next day with overwhelming & incapacitating exhaustion, severe headache, chills, muscle pain, nausea, sensitivity to light and sound, mental fog.

When I know I have a draining event coming up I plan in advance-2 days ahead I figure out directions to get there, what I will wear, gather some snacks to take along, plans for the dog. The most I will do the day before is shower and do my hair and maybe a puzzle, have meals cooked ahead. Otherwise I am still & quiet all day, watch movies, read. The day of I am still quiet, nap if it's an evening event, dress and go. I also plan nothing the following day in case some of that crash shows up.

Life just happens, and sometimes I spend more energy than I have in my body bank. I do what I have to and eliminate the rest; prioritizing is HUGE. Very few things can't be rescheduled, it may be a giant pain in the ***, but it is still better than knowingly setting myself up for a horrific day curled up on the couch in silence with the shades drawn & whimpering.

Failing to plan is planning to fail. I know I am not capable of ANYTHING if my brain & body is falling apart. Caring for myself is my #1 top priority, anything that puts me in harms way has no place in my life for right now. It's been 2 1/2 years and I have finally accepted this as my post covid life.