[2] He saw a rapid improvement in his results,[2] winning the silver medal in the javelin throw (700 g) at the 2012 South American Youth Championships in Argentina.

[3] The following year he won a gold medal in the shot put event at the Jogos Escolares da Juventude (Juvenile School Games); his mother surprised him by travelling to the city of Belém to see him compete for the first time.

[2] After settling on the shot put as his discipline, Morais captured the silver medal at the 2015 South American Junior Championships in Ecuador.

[10][11] Morais followed this up with a silver-medal performance at the 2020 Troféu Brasil de Atletismo, recording a throw of 19.43 m while Darlan Romani captured his ninth consecutive national title.

[12] On 26 March 2021, Morais threw 20.28 m for a first-place finish at the Reynaldo Berto Gorno South American Grand Prix in Uruguay.