In 2019, he chose to represent Australia in international competitions.[4]
Li qualified for the Tokyo 2020 Olympics and competed in the Men's 3m Springboard. He came 27th.[5][6]
At the 2022 World Aquatics Championships, he won a bronze medal in the 1 metre springboard event.[3]
At the 2022 Commonwealth Games, with diving competition held in August, Shixin ranked first in the preliminaries of the 1 metre springboard with a score of 388.70 points and qualified for the final.[7][8] He won the silver medal in the final with a score of 437.05 points, which was 10.00 points behind gold medalist Jack Laugher of England.[9][10][11] With partner Sam Fricker in the 3 metre synchronised springboard the following day, the duo won the bronze medal with a score of 374.52 points.[12][13] In the morning on day three of diving competition, he scored 456.65 points in the preliminaries of the 3 metre springboard, qualifying for the final ranking first.[14][15] He placed fifth in the final with a score of 448.50 points, less than 12 points behind fourth-place finisher James Heatly of Scotland.[16] The final day, he won a silver medal in the mixed 3 metre synchronised springboard with partner Maddison Keeney, scoring 304.02 points.[17][18]
