Many people told me that it is not easy to pronounce the ‘r’ in pinyin, especially if the Chinese ‘r’ is very different from their first language.
Here, I have a tip for you. If you can pronoun ‘zh’, ‘ch’ or ‘sh’, you can pick one of them, for example ‘sh’, and pronoun it as long as possible:
Then you will find that the last part of the very long ‘sh’ is the same as the pronunciation of ‘r’:
Hope this is helpful to you! Learn Chinese with Meiyi!