Cut yourself some slack.
In my deepest depression I didnt shower for 3 weeks and could barely drag myself from bed. It is so easy to guilt yourself for what you dont do or what you think you should be doing. It is easy to compare yourself to others and wonder why you cant just pull yourself together.
Sometimes in doing nothing at all, you are actually practicing a very important skill, self care. It is okay to not be okay.
Also, celebrate every win. I once texted my friends a picture of my clean oven. I was so excited. It doesnt matter if it seems "small" because sometimes the smallest things are also the biggest.
When talking to yourself, imagine you are talking to a dear friend who is struggling. Show yourself that same compassion.