I took it step by step really. One day I tidied the bed (changed the blankets or got clean sheets) the next time I had energy I got rid of food/food wrappers, and so on. little steps, and I had a trusted friend on call to remind me I was safe and to take breaks

First, have good food first, for me good food starts the good mood. Opening some calming or favorite music, I like to dance while cleaning up. Start with small things, maybe with any trash that you can pick up and put it in the trashbag. Put the dirty laundry to the hamper if you have any. Don't push yourself to clean everything in a day. Clean the bedsheets if your depression nest is also your bed (mine is). I usually leave the vacuuming/ sweeping of the carpet/floor at the end. Declutter can take quite a few days, so take it easy.

You are not alone with being so depressed your home gets a bit messy.. I have had all sorts of depressive episodes, and I just remind myself that I'm not well, and that I am human, and sometimes we are just sad and unable to do much.. and it happens sometimes. Occasionally, a list will help. Like, I will get a bit of paper, label it "kitchen" and then write each little thing I have to do there, and with each room. Then I will go into whichever room seems to need the most or least work and potter around until I have done a task and either keep going OR go do tasks in another room. Do the easier and smaller things first. Have breaks when you want them, and definitely crank some music!