I lost my religion, now how to overcome depression?

I used to be a very religious Muslim who prayed 5 times a day. But I left religion and could not adopt any other religion. And right now, since I cannot incorporate any set of rules into my life, I am in severe depression and living like a leaf. My life has no meaning or purpose. I feel empty. I can't study, I can't wash dishes or clean, even walking feels heavy. In short, I became a zombie. I'm too lazy for everything and all actions feel hollow. How do you think I can get my life in order?

I lost my religion, now how to overcome depression?
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