He scored a knockdown in the first round and won a unanimous decision against Bobo Sacko in Ho Chi Minh City, Vietnam.
He faced Sangmanee Sor Tienpo on August 21, 2020 in the ONE Bantamweight Muay Thai Tournament Semi-Final.
Kulabdam knocked out Sangmanee in the first round to advance to the Tournament Final, where was set to face Saemapetch Fairtex.
[2][3] On August 28, 2020, Kulabdam was dominated in the ONE Bantamweight Muay Thai Tournament Final, getting knocked down twice, and lost by unanimous decision to Rodlek.
[11] At the weigh-ins, both fighters failed multiple hydration tests and the bout proceeded at a catchweight of 150.75 pounds.