Please check this letter

Hello …;

I would like to thank you for the chance you have given me, by signing up for (the?) free online course (on ….com) called “How to learn English?” . Learning how to learn English; knowing how to use it are two of the most effective piece of advice I have ever received.

And sharing your English language learning experience to help those who didn’t get the chance to pursue their education abroad shows that you care about what’s going on around you and truly believe in giving back, providing education programs for your community free.

I cannot help but be impressed by someone who chooses to volunteer their free time to teach English to those who need it most. You are really demonstrating what is amazing about humanity in a world, unfortunately, based on helping yourself. Again, thank you, …, and I wish you all the best in your future endeavors.

I’m writing that letter to a teacher. Would you please improve it?