[6] At the same time, he enrolled as a pupil at Brøndbyvester Skole located less than one kilometre from the club, with his main course being physical education.

[7] Kvistgaarden was included in the first-team squad for the first time on 5 July 2020, ahead of an away match in the Danish Superliga against AaB, due to regular first team strikers Simon Hedlund and Samuel Mráz having been tested positive for COVID-19.

[15] In May 2022, Kvistgaarden scored four goals in three league appearances, including his first brace on the final matchday of the season against Silkeborg.

[20] On 4 June 2022, Kvistgaarden gained his first cap for the Denmark under-21s in the UEFA European Under-21 Championship qualifier against Kazakhstan.

[22] He scored his first goal for the under-21 team ten days later against Turkey, poking in the ball at the far post after an assist by Gustav Isaksen.