1. A student once asked his teacher, "Master, what is enlightenment?" The master replied, "When hungry, eat. When tired, sleep.". Maybe you're still hungry or tired?
2. Richard Feynnam and his spinning plates story deals specifically with his burnout: https://news.ycombinator.com/item?id=2291773
3. Refill your creative tanks. Expose yourself to experiences -- e.g. take a hike in scenic nature, or maybe travel to Rome for a week (edit: haha, not so easy these days!). Re-read books and listen to music that worked for you when you were younger. Some experiences won't resonate with you, but some might -- and that's why you're doing this.
4. Some passions / hobbies / occupations burn out for good. Don't be sad about that. I had it myself, and I have a friend who changed his career completely after a burnout.