I wrote a post a few pages on some tips. Hope that helps breh.
I don't sell T-shirts right now. I can but I'm working on some other things. I was giving another person advice who wanted to sell T-shirts on there. But my advice can really be applied to anything you're selling on Etsy. As far as marketing: it's all about your keywords and tags on each listing. You can pay for promoted listings but if your SEO and keyword game is on point then you'll be good. I HIGHLY suggest those thinking of selling anything on Etsy to go to
www.craftcount.com and find the top sellers in the category they want to sell. Look at the store's SEO, tags, listings etc. to see what they're doing, what product is selling the most, their policies etc. Study what they do and do the same. I honestly took about a good few days to study other top sellers in my category and took notes on what they were doing and I basically just replicated them but with my own wording.
Real talk, if you have the patience and consistency you CAN make money on Etsy. the TRAFFIC is already there. Just find a niche and go ham. Wedding and cats are really popular on Etsy for some reason and of course things that can be personalized. For instance, get a vector image of a damn cartoon cat and put it on a product (T-shirt, phone case, poster, mug, water bottle, pillow, tote bag etc. whatever your manufacturer offers to put your designs on) BUT personalize it (optional) to where your customers can include their own name, their cat's name, saying on the product. That's the real niche is the personalization because it's unique and you can't get it anywhere else. That's why Zazzle is a multi-million dollar company because everything on there can be personalize. If you want to do something easier, open up a cat t-shirt shop on Etsy (just an example). Have about 500+ listings with all funny cat sayings and EAT. (reference:
cat t-shirts - Handmade – Etsy UK). I'm telling y'all cats fukking sell! I have a handful of cat items in my store and they outsell EVERYTHING else I have to offer and I have about 500 products in my Etsy store.
And of course if you don't want to do all this work... Just upload whatever designs you have on Zazzle, Cafe Press, Redbubble, Society6 etc. Your commission will be shyt but you don't have to do anything except add designs. Personally, I like graphic design and really higher profit margins.