How to get to Sanya from Zigong by bus? Which route is the shortest? thank you

Zigong to Chongqing, transfer to G75 Yuzhan Expressway via Zunyi, Guiyang and Nanning to Zhanjiang, transfer to G 15 Shenhai Expressway (Zhanjiang to Xuwen section) to Xuwen, get off at 207 national highway for about 15km to haian port, get on the ferry, cross Haikou xiuying port, and take the southeast coastal expressway to Sanya. This route is not the nearest. For example, it is much closer to take the provincial highway S207 from Zigong to the expressway G75 from Luzhou, but it is much more convenient to take the non-expressway with high speed ratio.