To sell on Etsy, you have to have excellent photos. The more, the better. People can't touch your items, so the photos are what is going to make the sale.
Customers must find your products. Keywords in Tags and titles are where Etsy search takes place. Figuring out Etsy SEO is quite a challenge, but you have to do it. People will search for some of the craziest things. I was shocked to discover the "gift for mum" and similar were common search terms.
Some people do well on Etsy without doing much work. I have a friend that makes bases for antique sewing machines. His Etsy shop is empty much of the time because he sells them about as fast as he can make them. He breaks all the rules except photos. He is one of the exceptions.
If there is a lot of competition for your product, you have to figure out how to stand out. For example, searching for "wood toy cars" in Etsy search today returns 6,535 results. If the only keyword I have is "wood toy cars," what do you think the chances are that one of my toys showing up on page one? Just in case your curious, I am on page three today.
Selling online is hard work for most of us.