He was surprisingly left out of the Fremantle line-up for their opening game of the season against St Kilda.[8] Round 10 of the 2023 AFL season saw Amiss kick 3 goals during Fremantle's 29 point win over Geelong.[9] He was awarded a 2023 AFL Rising Star nomination in round 11 kicking 3 goals during Fremantle's 7 point win over Melbourne at the MCG.[10] Amiss kicked a career-high four goals during Fremantle's round 16 game against the Western Bulldogs.[11] He kicked an equal-career high four goals in round 22 against the West Coast Eagles during Western Derby 57.[12] Amiss signed a six-year contract extension during 2023 tying him to Fremantle until at least 2029.[13] He finished the season as Fremantle's leading goalkicker having kicked 41 goals in just his second season of football.[14]
2024
Amiss made the line-up for Fremantle's opening game of the season against Brisbane Lions at Optus Stadium. He kicked four goals and earnt a Mark of the Year nomination during the 23 point come from behind win.[15] Amiss also kicked four goals in round twelve during Fremantle's ninety-two point victory over Melbourne at Traeger Park in Alice Springs. He finished the match having earnt his second Mark of the Year nomination.[16] Amiss finished the season with 36 goals which placed him 2nd in the club leading goalkicker only behind spearhead Josh Treacy.