 Ahead of the 2018–19 season, Seymour returned to the National League South, signing for Gloucester City on loan.After one goal in twelve appearances for the club, Seymour joined Southern League club Dorchester Town on loan, scoring 14 goals in 26 games in the remainder of the season for the club.On 13 August 2019, Seymour made his professional debut for Exeter, starting in a 4–1 EFL Cup loss against Coventry City.