On 4 October 2018, Sebastian released "Before I Go", the lead single from his ninth studio album, "T.R.U.T.H." It peaked at number 43 and has been certified platinum. He became a coach on the 2019 season of "The Voice Australia". Sebastian was made a Member of the Order of Australia (AM) in the 2019 Queen's Birthday Honours in recognition of his "significant service to the music industry and charitable initiatives". In June 2019 he released the single "Choir", which has reached number seven, his 22nd top twenty single in Australia, and his 13th top ten. The single has been certified triple platinum. Sebastian toured Australia in September and October with his Ridin' With You Tour. On 1 October 2019, it was announced that Sebastian would host the ARIA Music Awards of 2019. He received 2019 ARIA Award nominations for Best Male Artist and Best Pop Release, and won for Best Video and Song of the Year for "Choir". The single "Standing with You" was released in June 2020 and peaked at number ten.