There's no simple answer to that it's related to how often and how well you use the language. To achieve the perfect thing you have to know the basics perfectly and practice them as well, anyway this is a general answer. If u face some issues with forming phrases in real life situations the solition is to surround yourself with the language from social media to movies and dramas you can find someone who wants to practice the language as well as you you can help each other. You can't earn self confidence without falling and cottecting your own mistakes.

It's all about practice i think, and another important thing is to think on that language, not to translate if you know what i mean