In addition to tours through Europe, the US, Japan, and Russia, Grunewald played with this band at many well-known festivals such as With Full Force, Summer Breeze, Deichbrand, Rockharz Open Air, and the Polish Woodstock.

During this time, he toured with many well-known bands, including Blessthefall, Silverstein, Electric Callboy, Falling in Reverse, Palisades, Emil Bulls, and Callejon.

Since 2019, he has been a solo artist under the name xHIGHTOWERx[1][3] and created his own experimental mix consisting of metal singing and hip hop, along with trap beats.

Since the beginning of 2022, Grunewald has had a podcast with pro wrestler Axel Tischer called Here We Go,[5] in which stories about traveling as an artist were told on a bi-weekly basis.

Grunewald also worked as a voice actor for the role of "Tomohiro Tsuboi" for the anime Gakuen Basara: Samurai High School in 2018.