[7] In the final of the 800 metre freestyle at Piscina Felice Scandone in the 2019 World University Games, Lamberti placed fourth with a time of 7:58.29, finishing just two hundredths of a second behind the bronze medalist in the event, Filip Zaborowski of Poland.

[3][10] Later in the year, at the 2019 Italian Winter Championships in Riccione, Lamberti swam a personal best time of 15:13.40 in the 1500 metre freestyle, winning the bronze medal in the event.

[21] For his final event, the 1500 metre freestyle, Lamberti won the gold medal in a personal best time of 14:38.45, finishing over a second ahead of the next-fastest competitor.

[26] At the 2022 Italian National Championships in Riccione in April, Lamberti placed fourth in the 400 metre freestyle with a personal best time of 3:48.23.

[31] At the 2023 Italian National Championships in April in Riccione, Lamberti lowered his personal best time in the 400 metre freestyle by 2.20 seconds to a 3:46.03 and won the silver medal.

[36][37] Later in the session, he anchored the CS Carabinieri 4×100 metre freestyle relay team with a 49.66 to contribute to a time of 3:17.79 and overall placing of fourth.