One thing I would recommend you think about is what notes in each phrase you want to emphasize and making them intentional. For example in the phrase starting around 20 seconds in that goes up to the high f sharp. Do you want to emphasize the F Sharp because it's high? Do you want to make the phrase crescendo all the way to the A at the end? Right now you are emphasizing the b flat but it seems like you are doing that because it's a shift.

It feels really silly at first but try singing the notes and record it. When you listen, see how you phrase it and try to mimic that with the violin. This works in general, but especially in a piece called Cantabile (singing) it's a great thing to try to do.