Contesting the entire 2019–20 NACAM F4 season and once again competing with Ram Racing, the season would prove to be a breakthrough, as León scored seven victories, which, coupled with eight further podiums, propelled him to title success.[1]
2021
In 2021, León progressed into the F4 United States Championship with DEForce Racing, partnering fellow countryman José Andrés Martínez.[2] Whilst he only scored two wins at Road America and Mid-Ohio across the year, the Mexican managed to move his way to the lead of the standings with a string of consistent podium finishes, culminating in a double podium at the Circuit of the Americas in a round supporting the 2021 United States Grand Prix, where León clinched the championship.[3]
León made his first step into European single-seaters in 2022, racing in the Formula Regional European Championship with Arden Motorsport.[4] He wouldn't score points at the opening two rounds in Monza and Imola, however this would change at Monaco, where he managed to obtain tenth place in the first race and ninth place in the second, scoring his first points.[5]
León partook in the FIA Formula 3 post-season testing at the end of September with Van Amersfoort Racing during the first day.[7] In the 2023 post-season testing, he again joined Van Amersfoort Racing.[8][9]
On 14 January 2022 Red Bull announced that León would be joining the Red Bull Junior Team in the form of a supported driver.[15] His contract only lasted a year and he was dropped by the team at the start of 2023.[16] Months after, the Mexican revealed that he had not received adequate support prior to the start of his first racing season in Europe, adding that he was disappointed that the programme had not "put [him] in a top three team", contrary to previous promise.[17]
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