Lorenzi also made the first ascent of Soudain Seul, a V16/V17 boulder.

[4] In February 2021, Lorenzi made the first ascent of Soudain Seul, a sit-start to Dave Graham's 2008 8C (V15) graded bouldering route in Fontainebleau called The Island, which was later extended by two small moves by Vincent Pochon in 2010 to become The Big Island, also at the 8C (V15) grade.

Subsequent repeats by Nico Pelorson in 2021 and Camille Coudert in 2022 softened the likely grade to V16/V17.

[6] In December 2022, he became the fourth climber to repeat Shawn Raboutou's 2022 problem Alphane, which has since become accepted as having a grade of V17 (9A).

[8][7] In December 2023, he became only the third climber to repeat Burden of Dreams, the world's first-ever V17 (9A) graded bouldering route.