When you can't think of a purpose (which changes, by the way, and you can create purposes), then try priorities.
Or something to enjoy.
Or something to learn about.
Learn to play a musical instrument. Perform.
Or something to notice.
Or make some art work about those flowers, about the market, or things you notice there, or anywhere.
This is me speaking of a difficult time in my own life - it was the art classes that became my purpose. And that has remained now for over 15 years.