R versus W pronunciation class. I find these two sounds very difficult too, so you have my sympathy. Only 8000 zaps for the pronunciation course consisting of 15 hours of lectures, 26 quizzes, and lots of tongue twisting sentences for practice
https://www.skype-lessons.com/courses/master-pronunciation
https://blossom.primal.net/53b6c973d08755f6fc5a67086526419c9f54a3ea4eec4ceddd408a10a4021e9e.mp4