I would use "had" instead of your first "gotten."Hello Dr …,
I'd very much love to take this opportunity to express my heartfelt thanks to you for
supportinghelping me get organized, inspiring edme to achieve so much, great things,and most importantly, getting me interested in learning the English language, which I think iswas a considerable feat! I've been so lucky to have gotten you as a teacher for whichwho helped me so much with my English. has gotten a little bit better.Also, you have beenprovided all the encouragement I needed. Your time, patience, keeping track of my progress, ing,creating a more comfortable atmosphere for me, and always clarifying things until I understandunderstood them arewere a great help. You're such a fantastic teacher - the best I've ever had.
Student or Learner