How do I find joy in my life again ?

To learn from past (bad) experiences. It's not always easy, I talk from my own experiences, but this is the only advice that worked for me. Count your blessings, learn from the past, and move on. Those are the words I have been telling myself. And be aware of your thoughts too. I mean, ask yourself what you focus on the most. Try to focus yourself on good things, imagine often good futures. Listen to uplifting songs. Occupational therapy. Helping other people. Those things can help. Things will get better.