How do I make a piece sound more confident?

My teacher told to me to play more confident. I started my lessons 5 months ago, so I’m not sure what does it mean and how do I do it?

The key to sound more confident is using more bow to achieve fuller sound. Don’t play everything in the same short area, but use the whole bow to its tip. 

Also practice every day. It will help you to gain muscle memory and fluidity so you will be able to play without thinking about the finger placement.