From Urumqi to Yining, and then from Yining back to Urumqi (round trip), the round trip is only 8 days. Is there any self-driving group recommendation?

You can rent a car in Urumqi by yourself. There are quite a few regular car rental companies. Car rentals are not expensive during non-peak seasons. There are also car rental companies in Yining

The ring road you mentioned may take the Duku Highway or Korla Baluntai. Three or four people can charter a car by themselves, and the time can be tight or loose. However, this loop is generally only available from June to the end of September. Deep in the Tianshan Mountains, the snow is thick and the wind is strong

It’s okay to join a self-driving group, there are quite a few people like you