After a season of college basketball in the United States for UC Riverside, he returned to the NBL1 Central in 2023 and helped the West Adelaide Bearcats win the championship while earning grand final MVP and All-Star Five honours.
[4] In October 2021, Olbrich signed with the Adelaide 36ers of the National Basketball League (NBL) as a development player for the 2021–22 season.
[4] Olbrich moved to the United States to play college basketball for the UC Riverside Highlanders of the Big West Conference in the 2022–23 season.
[10] He helped the Bearcats reach the NBL1 Central grand final, where they defeated the Forestville Eagles 106–95 to win the championship behind Olbrich's 24 points, 10 rebounds and eight assists.
Upon coach Justin Tatum taking over midway through the season, Olbrich went on to prove himself as a capable back-up for captain Sam Froling.
[19][20] In the semi-final, Olbrich had 22 points and 16 rebounds and made the game-winning layup with seconds left in a 112–111 double-overtime win over the Taranaki Airs.
[21][22] In the grand final, he had 29 points, 18 rebounds and six assists to lead the Rams to a 102–87 victory over the Auckland Tuatara to win the championship.
[26][27] In November 2024, Olbrich joined the Australian Boomers for the first time to compete in the 2025 FIBA Asia Cup qualifiers.