Congrats on all the sales for being so new!
I would be careful of reaching out to customers just for reviews after the sale is complete, and especially offering them a coupon code if they do leave one. Some people might see the initial follow up as spam, and than black mail if you give them a coupon. I'm not sure if offering something in return for a review might be against etsy rules or not, so just be careful. :)
If you do want to offer coupon codes for returning customers, there is a way to set up a "thank you" coupon that gets sent automatically when something is purchased. Also, in my notes to the customer when something is bought, and another when it is shipped, I have a quick blurb gently reminding them to come back to leave a review. But that is also among other info (to find us on social media, how long packages take to ship, thanking them for their order, etc).
WIsh many more sales for you!
