My family member has it, they went from severe to mild.
Pacing is the most tried & tested way to manage it. You need to work out what your energy window is and stay within that.
Do less than you feel capable of, rest more than you think you need to.
Reduce & avoid stress as much as is possible. I know this is easier said than done!
Start a daily relaxation practice - whatever works for you. With ME the body gets stuck in a fight/flight response so the goal is not to just reduce the immediate feelings of stress that you feel, but to help soothe your body's nervous system. Breathwork (like box breathing technique) or meditation are very effective for this. Mindfulness etc.
Try different things, remember it gets easier with practise.
Take regular rest breaks throughout the day. Studies have found just 10 minutes of meditation a day help ME patients manage fatigue and avoid crashing. But 10 minutes of proper rest - not on phone, not reading, not talking, not listening to a podcast...slow your heart rate and breathe deeply.
Try the Visible app - it's designed for ME patients and helps them pace.
My family member manages daily fatigue by taking rest breaks throughout the day 10 -20 minutes each time. Longer on days they need to. Theyve had to learn to accept they can't do everything they would expect to, can't keep the house as tidy as they would like to.
Try & identify triggers for PEM and learn to identify the warning signs that your body is struggling. Visible app helps with this.
Eat nutritiously.
Take shortcuts - use the dishwasher, the slow cooker, park closer to the shops. Buy pre prepared frozen veg.
Happy to talk more over message if you want