brush cherry

Hello everyone, I’m kinda new to bonsai...well by new I mean I suck at keeping them alive. I’m trying to start over and I recently got a Brush Cherry. My question is, I obviously want to make it grow larger and was wondering if I should repot it into a larger pot or let it stay in this...

I had this tree outside and a bunny decided to snack on it. It took the lower most branch, which I had been growing out for several years. It was about 5 inches long and really helped give some balance to my tree. As you can see in the pictures a new branch has sprouted out from the stump...