Sonsaca comes from the verb sonsacar, which means to entice, tempt, or coax someone into doing something, often something they might not otherwise do.
In the context of this song, Ozuna sings, "Casi siempre me sonsaca" (She almost always tempts me). It highlights the woman's power to allure and persuade him, making it an interesting and somewhat provocative choice that captures the song's theme of desire and seduction.
"Solita" is a flirtatious reggaeton track where the narrator asks a woman to stay home alone ("solita") and wait for him instead of going out. He promises to give her everything she wants and describes exactly how he plans to spend the night with her.
The song brings together several artists (Ozuna, Bad Bunny, Wisin, Almighty, and producers Mambo Kingz and DJ Luian), so the verses shift voices and slang throughout, from playful boasting about money and status to explicit descriptions of the encounter he's picturing.
It's a good song for hearing common reggaeton vocabulary and slang in context, including possessive terms of endearment and the kind of everyday Puerto Rican Spanish heard across the genre.