During 2019, Kongklai engaged in the 30th annual Isuzu Cup Tournament at Siam Omnoi Stadium.
On January 25, 2020 Kongklai once again rallied late to beat KingStar Rongrienkelakorat by decision and reach the Final of the Isuzu Cup.
He received the grand prize of 1 million baht and a brand new Isuzu D-Max Pickup truck.
Kongklai faced Thai Fight star, Ratchasing Rongrienkelakorat in the Isuzu Cup Super Fight on November 28 when he knocked out Ratchasing with an elbow in the third round to earn himself a spot in the King's Cup.
On December 9, 2020 the Sports Authority of Thailand committee voted unanimously in favor of Kongklai for the Fighter of the Year award.