I’m sorry to read about your situation. Your father’s decision is completely understandable. I hope others will support him and you in his journey.

Does he have care in the home? Like for household duties, meal prep, medication management, laundry, etc. Has he talked to his doctor about palliative care? Maybe, his doctor could suggest something to help him rest at night, so he’ll get sound sleep. Have they checked his vitamin levels? Is he dehydrated? I’ve heard that Vitamin infused IVs can boost energy. They even have boutiques that offer this service, though I’d check with doctor first. I hope you get more ideas.