Help check the grammar of this short paragraph

"As I found my volunteer experiences to be more and more rewarding, I realized that if I was going to make this change, I had to devote myself fully once again. In 2012, I formally resigned my corporate job to focus on becoming a doctor. While it has taken me some time to get here, my diverse experiences and the difficulties I have endured along the path have only strengthened my resolve and made me a stronger candidate for the practice of medicine. I hope you grant me the opportunity to continue on my journey to become a doctor."

Are there any grammar or punctuation problems with the above paragraph? Thanks!