In September Guan made her senior debut at the Chinese National Championships representing the Zhejiang provincial team. She led the team to win bronze in the team competition and individually qualified to the all-around final in second place behind reigning national champion Liu Tingting with a score of 55.900. She also qualified in first place to the balance beam final by a wide margin over reigning Junior World silver medalist Wei Xiaoyuan and reigning World silver medalist Liu. Her credited difficulty score of 7.0 was the highest of the 2017-2020 quad to that point. During the all-around final she suffered multiple mishaps on uneven bars, beam, and floor and ended the competition in sixth place. During the balance beam final she won gold with a secure routine ahead of Wei and Liu, and she placed eighth in the floor exercise final with a clean routine.