Afán translates to "eagerness" or "zeal." It's a less common word than synonyms like "deseo" (desire) and carries a stronger sense of intense effort or strong desire.
In the song, the lyric "Tanto afán por hacer que te quedes" (So much eagerness to make you stay) highlights the singer's intense desire and persistent effort to keep his love interest with him. This word choice emphasizes the depth of his feelings and his determination, making it more impactful than a simpler word.
Micro TDH's "Vuelve A Mí" is a heartfelt plea for a second chance in love. He's really trying to convince someone to come back to him, asking directly, "Dime, mamacita, si me quieres" [Tell me, pretty mama, if you love me]. He admits he made a mistake in the past, saying, "Hace un tiempo no fui tu mejor aliado y cometí un error" [A while ago I wasn't your best ally and I made a mistake], but he promises it won't happen again.
He's clearly smitten, thinking about her "En tus manos, tu sonrisa, tu mirada" [In your hands, your smile, your gaze] and just wants to be with her. He doesn't care what anyone else thinks, declaring, "No me importa lo que digan los demás, yo quiero darte amor" [I don't care what others say, I want to give you love]. He just wants to forget the bad times, dance with her, and throw all their problems away, asking her to "Empaca los problemas, bótalos por ahí" [Pack up the problems, throw them away]. It's a sweet and earnest song about wanting to rekindle a lost love.