I hear you with the fatigue. This is something that I've struggled with for such a long time. I'm the kind of person who can sleep for hours during the day and then sleep all over again all night.
Without hitting the word count and boring you, there's probably two things that feel important - one is similar to what Deckt said in looking at your priorities and what matters the most. If you've ever heard of 'spoonies' I think that one is really great in looking at where you want to allocate your energy - what are the things you can manage today? Will a short walk be doable for you or is this something you have to skip?
The other one is self-compassion, which has been the hardest ever thing for me to learn. Fatigue isn't just physical tiredness but also emotional and mental too - so noticing that and trying to be kind to yourself is so important. This is the difference with me pushing myself all day and feeling the fallout (like a hangover) and being able to pace myself and say that what I have done for now is really good enough.
While it's not for everyone, I always try and pick something that I can do for the day - even if it's little. It might get me really down if I've skipped the cleaning and the house is a mess, but if I can say 'yep, I've done this one thing' it's kind of a little win. Even if it's small.
Hope this helps