i agree ...i have days like those too ..which usually means your work life balance is wack.
try taking vaccation and spend time with your family or go see places.

Aslo sleep well , eat well and maintain a healthy life. Keep dal bhat to 1 meal a day ..too much carbs maks you lazy and sleepy.

Start a hobby for your favourite outdoor sport. You dont have to be good ..but do it and learn it ..something new to look forward to will give you better motivation.

Working out is also an awesme stress reliever ...If you do decide to work out ,,make a plan and achieve that plan.

For me vaccation reboots my motivation level.