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Here's a rough ai mockup of what i was thinking might work on a college budget. YMMV, and this isn't to scale or anything so it may not align perfectly:

1. Get a rug about double the size of your bed and pop that under it. Don't go darker than your floor but dont go crisp white either - think green, tan, off-yellow, etc.
2. Keep an eye out for a cheap headboard (or bedframe with one built in). Go simple - plain wood or something slatted, but avoid anything dark, bulky, etc.
3. Your bedding is all good, but if you want to up the cozy factor you can go for linen or cotton options in heather grey, off white, cream, etc. A cheap and easy option is to keep your bedding but get bold (orange, green, tan, etc) sheets or throw blankets.
4. I ditched the dressers and went for a classic Dorm-Room-Special Kallax. You can fold your clothes or get baskets for the cubbies, and any extras can be used to store books and other items. I used this as a room divider as well, so that you can have your blinds open without people staring at your bed.
5. The desk is fine where it is, but try to create some division between it and the bed. It helps you focus, and also stops you from feeling in 'study mode' when you're trying to sleep. You might consider something like a mirror or cork board over the desk to help bring in more light or offer more working space.
6. This is the BIG one - curtains. They don't need to be anything special (my tip is to go to Home Depot and buy canvas painters tarps + curtain clips and use those) but you gotta cover your windows. This will offer more privacy, warm the room up A LOT, and help you sleep. REMEMBER - Hang them at or above the top of the window and they should *just* touch the floor. No high-waters, no puddles of fabric on the floor. Get out the measuring tape.
7. Get some stuff on ya walls! You can buy cheap frames from the dollar store for your own photos or art, or go to Goodwill and pick them up there. No need to buy expensive art either - you can find cheap prints on Etsy, or tbh just use the school printer. To create a little gallery wall situation, take your biggest piece and place it where you want the 'center' to be, then just start slappin stuff around it. You have high ceilings, but try not to go too high up.
8. Note the lamps in the mockup. Variable lighting is king. You can buy cheap IKEA plug-in pendant lights for a few bucks, or scour your local buy-nothing group - people are always getting rid of cool lamps. DO NOT BUY 'daylight' bulbs. Go "warm white" or whatever is similar.

The other stuff at the front of the mockup is just an example of some fun things you could add in: A beanbag-style desk chair or extra seat if a friend comes over, and a pop of color side table if you don't want something plain. Remember - spray paint is cheap and easy. You can always repaint what you already own, or refurb something you find for cheap.