At the end of the season, he made his Japanese Formula 3 Championship debut with Hanashima Racing over the weekend at SUGO.

He then made his debut as a full-time driver in Japanese Formula 3 with the Corolla Chukyo Kuo TOM'S team.

Kotaka still raced in Super Formula Lights in 2021, albeit only for one round, where he managed to get 2 podiums.

He then won the title with eight wins and eleven podiums, as he beats Kakunoshin Ohta and Iori Kimura.

[3] Kotaka made debut in GT300 class for apr in Super GT for two races at Fuji Sweedway, sharing a Toyota GR Sport Prius PHV apr GT with Hiroaki Nagai and Manabu Orido, but scored no points.

[4] Kotaka also competed full-time in the GT300 class of the Super GT with the team Advics muta Racing INGING, sharing a Toyota 86 MC GT300 with Ryohei Sakaguchi.

Kotaka made his full season debut with apr number 31 new Lexus LC 500h GT alongside Saga and Yuki Nemoto where both claimed one podium.

After He won the Super Formula Lights title, he returns to the series in 2023 with Kondo Racing.