At the end of 2017, following a series of losses he went back to compete in the provinces, at this occasion he changed his ring name to Petchsamarn Sor.Samarngarment.
[3] The following month he defeated three weight Lumpinee Stadium Champion Ronachai Tor.Ramintra by decision, taking his win streak to nineteen in a row and cementing his position as an elite fighter in the 122 lbs division.
[4] Petchsamarn's undefeated streak came to an end when he was defeated by decision in a fight against Prajanchai P.K.Saenchaimuaythaigym on December 6, 2019 [5] They rematched with the vacant Lumpinee Stadium 122 lbs title at stake.
[7] His losing streak reached its lowest point when he was stopped by Boonlong Petchyindee in the second round on October 9, 2020, at Rangsit Stadium for the Muaymanwansuk promotion.
[8] Back to competition after a nine-month break due to the COVID-19 pandemic, Petchsamarn faced Petchmaeprik Fordpayakdaennua for the vacant Channel 7 Stadium 122 lbs title on December 12, 2021.