You gain access to SoDoSoPa on Day 3 of the story. You can still return after completing the story. There is a wind wheel you can inspect and use your buddy Human Kite to Fartkour up the lofts by the homeless camp. You need to Fartkour multiple times to get to the top. Once at the top, talk to Human Kite again to Fartkour back to the bottom and get the "Divine Wind" trophy.