First you need to pick an accent, and you need to practice with videos (movies or series) that you enjoy, or things that you enjoy, and try to copy the way to say the words, write down some vocabulary, but the most important thing is having conversations with natives,
Considera tener clases de conversación conmigo, estoy seguro que te va a ayudar a mejorar mucho. Que te vaya bien ✌️