In Round 19 against the Wests Tigers, he scored a hat-trick in the Broncos' 42-16 win at Suncorp Stadium. He finished the 2015 season as the Broncos' highest try-scorer with 15 tries in 20 matches. On 15 December, Maranta was named on the interchange bench for the World All Stars to play against the Indigenous All Stars in the 2016 pre-season. 2016 On 19 January, Maranta suffered a massive setback before the season after he fractured a bone in his wrist at training, robbing him of his selection in the 2016 All Stars match. He was expected to miss about 10–12 weeks of football but made an early return in Round 4 in the grand final rematch against the North Queensland Cowboys, which ended with a 21-20 golden-point victory to the Broncos. After the match, Maranta was relegated to playing in the Queensland Cup for the Norths Devils but succumbed to a knee injury and was ruled out for eight weeks. Maranta returned for the Broncos for the second time in Round 12 against the Wests Tigers, scoring a try in a 19-18 loss. Maranta finished his last season with the Broncos by playing in eight matches and scoring three tries. In August, Maranta signed a two-year deal with the Queensland Reds in the Super Rugby, following the lead of former Broncos wingers Willie Carne, Wendell Sailor and Lote Tuquiri in switching over to the 15-man code he had played during his high school years. After the signing was announced, Maranta was subjected to criticism by former Wallabies player Greg Martin, saying, "If Wayne Bennett is prepared to get rid of his godson and his former PA’s son and Brett Plowman’s son in Lachie Maranta. If he’s prepared to get rid of him, that would indicate that he’s a crap player. The Reds immediately snapped him up and crowed about it. That is the worst signing I’ve ever seen." 2019 On 13 December 2018, Maranta signed a contract to join St. George-Illawarra for the 2019 season. He made his debut for the Dragons in round 14 against Manly-Warringah at Brookvale Oval. Maranta made one further appearance for the first team during the 2019 NRL season but spent the majority of the year playing for the club's reserve-grade side which won the minor premiership in the Canterbury Cup. In November 2019, it was announced that Maranta had been released by St