Movement. Getting warm from moving myself helps me infinitely. Falling motivation for that, give a sauna a go.

Taking vitamin D?

Start going for walks in the morning and evening. Retrain yourself from thinking that dark outside = sleepytime.

Go outside while there is daylight. It’s a small counter to the darkness without any side effect.

Seasonal depression. Really bright lights on a timer in the morning.

I used to use those halogen work light set up beside the bed with a special dawn simulator timer. But it looks like they are out of business. In the end, I just moved to Florida to avoid winter,

here are some commercial dawn simulators. Go for maximum lumens
https://www.amazon.com/dawn-simulator/s?k=dawn+simulator

In the winter, you get less sunlight into your eyeballs, especially with the closed-off caves we live in these days. Which means your body doesn’t inhibit melatonin production properly. Which means you never properly wake up.

I have a really bright room light to combat that. Daylight lamps for desks are also available. Heading outside around noon is also a good idea.

Cocaine.

Lookup seasonal affective disorder. SAD.

Could try light therapy. Buy a specialized light and spend time under it reading a book.

Also winter sports. Skiing etc…

Sounds like you need a sport that can be done in the winter. Indoor sport. Swimming, racquetball, etc.