ESL and Spanish Teacher | E-Learning Instructional Designer
Consistency and perseverance. Choose an intense course, you can study from home, online, and practice 30 min a day (at least). Make sure you are developing all 4 macroskills: reading, writing, listening and speaking. Don't be shy about speaking, you need to make mistakes to learn. Complement your course with phonetics and phonology, there are tons of info and books online. You don't need to sound like a native, you just need to sound good.