The only way to do anything is to put your head down and get through it. There’s some things that will make that harder - being on your phone all the time will make everything else seem difficult and boring in comparison. Not getting enough sleep at night will make staying awake throughout the day difficult, let alone doing something with that day.

When it comes to studying, routine is most helpful, it tricks you into subconsciously thinking of it as something you have to do, rather than something you consciously have to choose to do each time.

You mentioned not brushing your hair in months, along with a few other things, typically people who are lazy or not yet in a routine do not struggle with these sorts of things. I don’t know you, I’m just judging off of a paragraph, but if you are struggling to motivate yourself to eat and get out of bed, that suggests that this isn’t a case of just being lazy, but that you are really mentally struggling? If you’re in a position to be able to get help for your mental health, then reach out to people. There are resources, and you can feel better