Aprovéchala is the imperative form of the verb aprovechar (to take advantage of, to make the most of) combined with the pronoun la (it).
In the song, Ozuna sings, "Hay una sola oportunidad en la vida, aprovéchala, ma'" (There's only one opportunity in life, take advantage of it, ma'). It's a powerful and direct call to action, urging the listener to seize the moment and make the most of life's chances.
"Vida" is Ozuna's tribute to a woman he still can't get over, using "vida" (life) as a term of endearment for her throughout the song.
He opens by promising loyalty wherever she goes, saying he gives more in the relationship than he gets back. He admits he didn't know how much he was risking by loving her this hard, and now nights alone leave him talking to his pillow, wondering when she'll come back.
The chorus keeps circling one question: is there anyone else, because he doesn't want anybody but her. He asks her to stop making him wait and just make up with him instead.
Near the end the song turns reflective, with a line about how someone who doesn't know what they're looking for won't recognize it when they find it, and a reminder that life only gives you one shot, so take it.