[4] Loos was selected to represent the United States at the Pan American Championships alongside Cameron Bock, Spencer Goodell, Kanji Oyama, and Genki Suzuki.

[6] Loos competed at the 2019 Winter Cup where he placed 16th in the all-around but won bronze on floor exercise behind Sam Mikulak and Jacob Moore.

[9] He also started competing for the Stanford Cardinal in collegiate gymnastics; however the NCAA season was cut short due to the ongoing COVID-19 pandemic.

[12] Loos was selected to compete at the 2021 Pan American Championships; he helped the team win the silver medal behind Brazil and individually he finished fourth in the all-around.

[18] He was selected to compete at the DTB Pokal Mixed Cup in Stuttgart alongside Colt Walker, Curran Phillips, Katelyn Jong, Karis German, and Levi Jung-Ruivivar.

[21] In June Loos was selected to represent the United States at the Pan American Championships alongside Brody Malone, Yul Moldauer, Colt Walker, and Shane Wiskus.

[22] On the first day of competition Loos competed on floor exercise, rings, vault, and horizontal bar to help qualify the United States in first place to the team final.