Jerarquía translates to "hierarchy" and refers to a system where individuals or groups are ranked one above the other according to status or authority.
In the context of this song, it likely refers to the internal structure or chain of command within the group or organization the singer is associated with. The line "Siempre fuertes y unidos pa' la jerarquía respaldar" suggests a strong sense of loyalty and commitment to maintaining and supporting this established order.
"No Está Facil" is Peso Pluma walking through everything that comes with the corridos tumbados lifestyle: the connections, the money, and the loyalty it all runs on. He opens by naming the network around him, "Circulando por los ranchos y en playas fifi" [Rolling through the ranches and on bougie beaches], then gets specific about the product, "Las libritas, las onzitas" [The pounds, the ounces], with "La Hulk y la green" [The Hulk and the green] naming the strains that back his crew up. The whole first half plays like a résumé of the business, right down to "Está fácil dar confianza pa' cualquier cabrón" [It's easy to trust any b*stard], which he means as a warning more than a boast.
The song turns soft at the very end. After all the talk of staying "modo cholo" [in cholo mode] and keeping the crew "fuertes y unidos" [strong and united], he closes on his mother, "Por las bendiciones de mi 'amá en el cielo" [Thanks to my mom's blessings in heaven], and carries her advice with him everywhere: "En mi mente y en mi corazón sus consejos yo siempre llevo" [In my mind and in my heart I always carry her advice]. It's the one gentle moment in a hard song, and it's what the title is really about: none of this is easy, but her memory is what keeps him steady in it.