[4] Fulton moved up in weight for his next fight, as he was scheduled to face Isaac Avelar in a 124 lbs catchweight bout.

[6] Fulton was scheduled to face the unbeaten Arnold Khegai on January 25, 2020 at the Barclays Center in New York City, United States.

[8] His victory against Khegai earned Fulton the right to challenge the reigning WBO champion Emanuel Navarrete.

[9] Fulton was scheduled to face Angelo Leo for the vacant WBO super bantamweight title on August 1, 2020.

[12] On December 20, 2020, it was announced that Angelo Leo would make the first defense of his WBO super bantamweight title against Fulton.

The fight was scheduled as the main event of a triple-header set for January 23, 2021, at the Park Theater in Las Vegas, Nevada, United States.

[14] Fulton was scheduled to face the WBC super bantamweight titlist Brandon Figueroa in a title unification bout on September 18, 2021, at the Park Theater in Las Vegas, Nevada, United States.

The fight was originally set for September 11, but was pushed back a week, as PBC required a new main event following the negotiation breakdown between Canelo Alvarez and Caleb Plant.

[24] Fulton justified his role as the -550 betting favorite,[25] as he won the fight by a wide unanimous decision in front of a sold-out crowd of 4,695.

[29] On January 16, ESPN reported that Figueroa would instead face Mark Magsayo, as Fulton had entered into negotiations with the former three-division world champion Naoya Inoue.

[35] Fulton was scheduled to face Carlos Castro in a 10-round featherweight bout at T-Mobile Arena in Las Vegas on September 14, 2024.

[37][38] On October 10, 2024 it was announced that Fulton would face the current WBC featherweight champion Brandon Figueroa at Toyota Center in Houston, TX on December 14, 2024.