Ahead of the 2023 season, Heinrich was promoted to contracted Porsche Driver status. Heinrich was also selected for financial support from the ADAC and DMSB as part of their Motorsport Team Germany program. With that backing, he took on a drive in the Deutsche Tourenwagen Masters for the first time in his career, piloting a Porsche 911 GT3 R for KÜS Team Bernhard. He supplemented his DTM program with a drive in the GT World Challenge Europe Endurance Cup with Rutronik Racing, joining Dennis Olsen and Thomas Preining in a Pro class entry.
