After defeating Jesus Urbina at KOTC Thunder via unanimous decision and Saul Elizondo in the second round via rear-naked choke at Jackson-Wink Fight Night 1, Riveria made his Legacy Fighting Alliance debut at LFA 10, where he faced Zac Riley and went on to defeat him via unanimous decision.
During this time, he would dig wells with one arm a couple weeks after elbow surgery, desperate for any job to make sure he was providing for the arrival of Emilia, who was two years old.
Making his return to Legacy Fighting Alliance, he took on Kendrick Latchman in the co-main event of LFA 80 and submitted him via triangle choke in the second round.
[7] Moving back down to Flyweight, Rivera faced Francisco Figueiredo at UFC on ESPN: Chiesa vs. Magny on January 20, 2021.
[8] Rivera faced Ode' Osbourne on February 6, 2021, at UFC Fight Night: Overeem vs. Volkov in a featherweight bout, as a replacement for Denys Bondar.