I thought I knew stuff about nutrition, then I hired a professional and learned that lots of so called “healthier” or “better” foods were not so. I also learned not to think about food in terms of good or bad, food has no morals. It has been a great adventure to learn so much about how to take care of myself and feed me in the best way that I can each day.
Good for you OP! Spanish is such a rich, beautiful sounding language.
My best bet, aside from full immersion is to first, take lessons in order to learn good foundations and know how stuff works and then, hire a language coach who can help you with your specific request.
Source: I help people doing exactly that. Some want to learn an accent, some want to lose an accent, some people need help getting more confident in their second or third language, etc.