The only proven way is to speak regularly with native speakers. Standard approach is find a native speaker tutoring application like Preply. Pro approach is to

The only proven way is to speak regularly with native speakers. Standard approach is find a native speaker tutoring application like Preply. Pro approach is to get an English speaking significant other and kick into high gear. My 79 year old mother taught English as a Second Language for 20 years in Kentucky and is pretty bored. She would be happy to help you level up .