He left briefly to play for Atlas in Mexico in 2020, before returning to the MLS with Cincinnati in 2021. He has lived in the United States for six of the last seven years. Federal law dictates that U.S. green card holders, of which Acosta is one, must continuously reside in the U.S. for five years in order to be eligible for citizenship.
This section does a pretty terrible job of explaining how he is still able to pursue naturalization without the clock completely resetting after his stint with Atlas. Did his wife stay in the U.S. and earn naturalization herself while he went down to Mexico? If not, shouldn't the earliest moment that he could apply for citizenship be 2025?