Y’know, it happens, and it’s fine. Lack of energy is a sign to be kind to yourself and rest up.
You have a high bar for your cooking at home from what you post here, maybe go easy on yourself for a while and stick with the simpler preps vs cooking that needs attention?
Arctic char is my old roommate’s favorite fish, she treats it exactly like salmon. Favorite prep? Salt, pepper, broil or roast, finish with lemon. No effort + delicious. (For a kick, coat with mustard or wasabi or harissa first, straight or mixed with a bit of mayo.)