[1][2] The end of 2022 to beginning of 2023, he transitioned coaching and training methodologies, one change of which included swimming in the evening instead of the early afternoon.

[5][6][7][8] For swimming competition at the 2022 World Aquatics Championships, held in June at Danube Arena in Budapest, Hungary, Galossi entered to compete in the 400-metre freestyle.

[21][22] Ten days later, at the 2022 Italian National Summer Championships in Ostia during the 2022 European heat waves with temperatures around 40 °C (104 °F), Galossi lowered his personal best time in the 800-metre freestyle to a 7:46.28, which marked a drop of over three seconds.

[23] Galossi was the youngest swimmer named to the Italy team roster for the 2022 European Aquatics Championships, held in August in Rome, at 16 years of age.

[26][27][28] The following day, he ranked fourth in the preliminaries of the 800-metre freestyle with a time of 7:49.08, qualifying for the final less than two-tenths of a second behind third-ranked fellow Italian Gregorio Paltrinieri.