[5] In 2019, Kusumawardana reached the final of the International Challenge tournament in Iran with Yeremia Rambitan, but was defeated by their compatriots Adnan Maulana and Ghifari Anandaffa Prihardika in straight games.

[15] In October, they reached the second round of 2021 Denmark Open[16] and won the Belgian International beating Muhammad Shohibul Fikri and Bagas Maulana in the final.

[17] In November, they lost in the semi-finals of 2021 Hylo Open to fellow Indonesians Leo Rolly Carnando and Daniel Marthin.

[18] They reached the quarterfinals of 2021 Indonesia Masters to face fellow Indonesians Marcus Fernaldi Gideon and Kevin Sanjaya Sukamuljo.

[21] In February, Kusumawardana and Rambitan participated in Badminton Asia Team Championships with Indonesia and lost the title to Malaysia.

[36] They competed at the home tournament, Indonesia Masters, but lost to first seeds and seniors Fajar Alfian and Muhammad Rian Ardianto.

[39] In March, Kusumawardana and Rambitan competed in the All England Open but lost to eventual runner-ups Mohammad Ahsan and Hendra Setiawan.

[43] In May, Kusumawardana made his second appearance at the SEA Games and won the gold medals in the men's team and doubles event.

[44][45] In late May, Kusumawardana and Rambitan went to the Malaysia Masters, but lost at the first round to second seeds Aaron Chia and Soh Wooi Yik.

[48] They later became semifinalists at home tournament Indonesia Open, losing to second seeds Aaron Chia and Soh Wooi Yik in three games.