[2] Dejrit did not box again for a decade until he graduated from Indrachai Technical College, earning a vocational certificate as an engineer.
[4][5] At Yontharakit Gym, Dejrit was able to win the Rajadamnern Stadium Featherweight (126 lbs) title by knocking out Rerngsak Sor.Lukpitak in 1961, a division which he quickly outgrew.
In the following years he would fight Adul Srisothon, Rawee Dechachai, Huasai Sittiboonlert, Sompong Jaroenmuang, former campmate Danchai Ploenjit, Kongdej Lukbangplasoi, Wicharn Sor.Pinjisak, etc.
[2] On May 8, 1963, His Majesty Rama IX personally gave Dejrit the "Royal Cup" for defeating Rakkiat Kiatmuangyop at Lumpinee Stadium.
[7][8] In 1966, he defeated Suponchai Jaroenmuang for the vacant Rajadamnern Stadium Welterweight (147 lbs) title which he then defended against Apidej Sit-Hirun.
[2] In 1971, he transferred to Na Bangkok Gym owned by Narong Kittikachorn while serving in the military, but as he had entered his 30s, his physical condition declined and he could no longer fight at the high level he once did.
[12] The week after, on March 7, 2023, he received a state funeral and cremation ceremony in Bangkok, attended by his relatives, several former politicians, the Thai Prime Minister's Spokesperson Anucha Burapachaisri, the Director of Rangsit Boxing Stadium, and many of his peers and campmates such as Pudpadnoi Worawut, Padejsuk Pitsanurachan, Thongbai Jaroenmuang, and Rawee Dechachai.