[4] On June 27, 2018 Sibmuen faced Tsukuru Midorikawa for the vacant Rajadamnern Stadium 154 lbs title.

[6] On February 17, 2019 Sibmuen challenged Hinata for his REBELS 154 lbs title in Tokyo, Japan.

He lost the fight by knockout due to low kicks in the third round[7] Following the covid crisis Sibmuen went away from competition to go back working with his father.

During the same period he started documenting his career on his youtube channel and reached over 1.5 million subscribers in two years.

[8] In 2022 he made his return to competition for a celebrity fighting show where he defeated former Rajadamnern champion Jos Mendonca by unanimous decision.