[5][4] In his first senior nationals at the 2015 Australian Athletics Championships, he competed in both the 100 metres and long jump, reaching the semifinals of the former and placing 10th overall in the latter.

[7] Mitrevski won his first national title at the 2017 Australian Athletics Championships in April, qualifying him for the World University Games where he finished 4th in the long jump.

[3] He won his first international medal at the 2019 Oceania Athletics Championships, finishing 3rd behind winner Henry Smith.

[9][10] Due to a technical issue, Mitrevski struggled following 2019 and did not set another personal best in the long jump until 2022.

Though there were a "multitude of reasons" for the issue, Mitrevski was not able to jump without over-rotating, failing to clear 8 metres in most of his attempts during this time.