He started for Team Zakspeed BKK Mobil Oil Racing in a Mercedes-AMG GT3 with Kelvin Snoeks being his teammate.

At the Lausitzring he collected his first race win in the ADAC GT Masters together with his teammate Dorian Boccolacci.

In 2021 he started for MRS GT-Racing in a Porsche 911 GT3 R. In the opening round of the season at the Motorsport Arena Oschersleben he achieved a single podium finish together with Maximilian Hackländer.

[4] In 2022 he joined Emil Frey Racing driving in a Lamborghini Huracán GT3 Evo together with Konsta Lappalainen.

[7][8] In 2023, Wishofer made his debut in DTM, competing for GRT Grasser Racing Team.