"I'm not known by many, but those who do know me, LOVE me!"
--- I like this! Thats what I strive for too :) I'm just one person, I can't talk to thousands of people ... but I make sure that those who I do business with love the experience.
I've been selling on Etsy for about 2 and half years, and have quite a lot of repeat customers by now. Some come back every autumn to buy a new hat. It doesn't seem much, but it adds up.
The things that worked for me: quality product and great customer service. I only send out items that are perfect, if I accidentally pull a yarn somewhere or make a mistake, I unravel it or give it to a family member, not a paying customer.
Properly describe and photograph your item. Make sure the colors are as close to true as possible, describe sizes, materials. Make sure nothing is hidden that might be a turnoff for someone. if it looks great from front, but not so great from the back, make sure to show it! Or you'll just get an unhappy customer.
Good customer service is a must too. I always send a convo to confirm order and expected shipping date. Ship promptly and when promised - or apologize profusely if you can't fulfil the original promise for w/e reason - 99% people will understand, but they prefer to know what's up.
Have a flexible exchange and return policy. Give realistic shipping estimates. If you mess up with the order (wrong item sent, some detail missing, etc), bend over backwards to make up for it.
If someone has a special request that doesn't take much effort or expense from you, do it. Add a small birthday card, or a gift wrapping. People do really appreciate these personal things, especially on a business model like Etsy, where the personal connection is what sells your shop.
People talked about newsletters and FB, and I'm sure all those things are great too, but quality product and great customer service is still the most important ... you don't shop from someone just because of their cute instagram account.