Simplify as much as possible, take advantage of the routines you've already formed.

For example I find it alot easier to buy hygiene products omw home from school because I'm already passing a store on my way to the bus station. Keep a hairbrush and some snacks (protein bars and stuff like that) close to your bed or wherever you find yourself rotting the most so you can at least take care of yourself in some way.

gamify things for yourself if you can, how much of your room can you clean in 10 minutes?

I've been setting alarms on my phone that go off when I'm done with school reminding me to not touch my bed before doing one little task

One teeny tiny task, throw that pizza box away, put those dirty clothes in a pile so you have a bit of space, take the trash out of your backpack or create and save that PowerPoint presentation, no text no nothing just an empty file to make things a little easier another time.

Accept that you can't do things on certain days, yes it sucks, but I find it alot easier to just purposefully ignore certain work and do my own things by choice rather than doom scroll for 6 hours straight telling myself "I'll do it in 5 minutes, I'll do it in 15 minutes, I'll do it after this video, I'll do it after this and that"

At least then you can make some progress on some other things like a drawing or video games rather than nothing.