Well done Kara! I have been teaching English on here for 8 months, so 3 years is a huge achievement!
You write excellently in English and I have marked this very strictly to help you further improve. You need to use the "present perfect" tense in the situations below that I have changed. This is because the time period is "since I started teaching on italki until now" - this is an open time period and thus needs to be in this tense.
I hope that helps and good luck helping more students to learn!
Tom
This is my third year on italki!!
This is my third year since I started tutoring on this website. Luckily, I have been able to meet many students whose learning styles match with my teaching style and find my lessons useful. I have kept all lesson plans and teaching/learning records of the students who have taken my professional lessons. Today, my first file became full filled and I started the second file.
This is amazing to see the students’ progress over the couple of years and I am very proud how much effort they have put into learning Japanese while they are leading having a busy life. I am very lucky to meet very sincere and enthusiastic students. I could not have continued for such a long time without those students’ support.
いままで どうも ありがとう。そして、これからも よろしく おねがいします。