The more you talk the more fluent you will become.
Your level does not matter just talk! Being accurate comes with practice and practice is talking.
Think about English as a sport.
The more you practice - the better you get.
I read a story yesterday about a baseball player in the 1950s who was a real slugger. People called him a "natural", meaning he had a special talent for hitting the baseball. He wasn't and he didn't. In the off season he hit a knotted piece of rope every day after work with a weighted bat - 600 times. Every day he swung the heavy bat 600 times and hit the knot 600 times before he went to bed.
Practice makes perfect … and builds fluency.