[7] On 19 January 2021, McCormick scored an impressive free kick to level the scores as Rovers came from 2–0 down to get back to 2–2 against Crewe Alexandra in a match they eventually lost 3–2,[8] the goal being nominated for the league's January Goal of the Month award on 19 February,[9] surprisingly winning the award a week later by public vote.

On 2 July 2021, McCormick returned to League One, this time on a permanent basis, as he left the club he had played for since the age of six to sign for AFC Wimbledon.

[14] Going into the final day of the season, AFC Wimbledon were three points from safety with a seven-goal swing required in order to survive relegation.

[17] He made his second debut for the club on 30 August from the bench in an EFL Trophy tie with Plymouth Argyle, scoring in the shootout defeat following a 1–1 draw.

[24] On 17 January 2025, McCormick joined National League leaders Forest Green Rovers on loan for the remainder of the season.