There he joined the Sit.Or gym through his uncle which took him to a level high enough to headline shows at Rajadamnern and Lumpinee stadiums at the age of 14.
He received calls to participate in various kickboxing world tournaments in China, prominently Kunlun Fight and Wu Lin Feng.
He won the semifinal bout against Liu Yaning by KO, but lost a unanimous decision to Jia Aoqi in the finals.
[13][14] On July 26, 2023, it was announced that Petchtanong was stripped of the title and suspended from ONE Championship for a year due to testing positive for both metenolone and boldenone, banned substance according to the World Anti-Doping Agency (WADA).
[17] However, the bout was cancelled when Petchtanong failed hydration and missed weight and was hospitalized and required IV drips.