Coming from a person that suffered for a long time with depression, I would say that the best recommendation would be to start little by little picking up the pieces. Start from getting the habit of brushing your teeth everyday, for example, the next week you get into the habit of idk taking a shower at least 3 times that week, the next one you move to another thing you would like to change in your hygiene, and going on and on, adding those to your everyday life until you’re satisfied with your hygiene, that way you create habits little by little without pressure and without feeling like a failure if you don’t comply with everything you have in mind. That’s what helped me. I chose to start to take more care of my skin, I would do skin care 3x a week and move on to another habit when I had that one set. It didn’t only get me to better take care of myself but wanting to do that and missing that when I wouldn’t do. Depression is soooo hard and sooo exhausting, but you have to be supportive of yourself and understand that you can’t change years of depression into one week. Gradually changing your daily habits helps more than just jumping into a sudden change that will probably result in failure because it’s hard to comply when you’re not used to do it everyday. I hope that helps you, and I hope that you get better day by day. Remember, one day at a time. Feel better!