OP, just coming in to say a huge big Well Done to you. You have accomplished so much and you are only 22.
I am very sorry to read that you are coming out of a hard depressive time and that you find keeping on top of your accommodation overwhelming.
My DDs are similar ages to you. Neither aspire to sparkling clean accommodation.
Probably because they grew up in a house that is reasonably clean and tidy, but not perfectly so!
Life is for living. Make sure you make time for the fun stuff. Short cuts are fine. If you live on your own you don’t need to hoover every surface every week, just the areas you use most, you don’t need to clean skirting boards or windows weekly…
I would prioritise Kitchen/Dining area, Bathroom, followed by Bedroom.
Bathroom: One person using it, weekly or twice per week is fine. Spot clean as required.
Kitchen: worktops daily, cooker top after every use. Quick sweep of floor regularly.
I find to tidy as I go best and quick clean at night.
Bedroom, put away as you go. Try not to cause clutter in the first place.
Beds ideally change weekly, but if you miss a week here and there, no biggie.
Laundry, I try to iron as little as possible. I shake out all laundry before drying. Mostly I air dry, but also for tumble dryer. I smooth out creases and fold as soon as clothes dry. And try put away immediately.
It is OK to not have your accommodation perfect at all times. Life gets in the way at times. Keep it clean enough that you would be comfortable with a friend calling in unexpectedly. And remembers your friends won’t expect it to be clinically clean!
If overwhelming, break down into small jobs that you can do in maybe 30 mins. Don’t try do everything at once. Eg, if bedroom is messy, make your bed and choose a corner to declutter. 4 corners in a room, aim to do 1 a week… In 4 weeks room will be decluttered.
Get into a habit of putting things away immediately. So from dryer, smooth and fold and put away in drawer/wardrobe. Put dirty laundry straight into laundry basket, hang up your coat when you take it off. Put rubbish into bin immediately. Wash up and put away after eating, or just load to dishwasher if you have one.
Also don’t wash all clothes after one wear. You should get several wears from jeans, sweaters. Have someplace to hang the clothes you will rewear. For me it is a chair. But don’t leave them there forever, rewear in coming days/next week.
Do you have enough storage? If not clear plastic boxes are great. Especially ones that will fit under a bed, or large ones (maybe colourful ones) to place at the end of your bed.
Baby steps. Little and often. Progressive improvement. Rome wasn’t built in a day…
And be kind to yourself! Everything doesn’t need to be perfect. Good enough is fine.
Wishing you all the best!! And sending you lots of encouragement.