I was thinking of getting a Spanish speaking misstress, but for some reason I don’t think my wife would approve. I’ve tried many books but this book, with duolingo, 501 Spanish Verbs, a good Spanish dictionary, and a course like Fluenz, Spanish fluency seems to be obtainable without years in some college.
https://www.amazon.com/Complete-Spanish-Step-Premium-Second/dp/1260463133