As a person who is an avid Etsy customer, maybe I can help.
There is nothing wrong with selling your crocheted goods on Etsy, if that is your strength then definitely go with what you know. But I have a couple problems with what you said in your original post.
I may make stuff like amigurumi animals, scarves, and whatever else I happen to find patterns for that I like later on if I feel like sticking with something for a while
Using patterns to make goods for profit isn't cool. It's usually stated at the bottom of most patterns that they are only intended for personal use. If you find a pattern that states it can be used for sales, then okay, no problem. But this is not the case in most situations. As a customer, I see way too many people on Etsy using patterns that I am sure they did not get the permission to sell. If I see this, I never buy from that individual.
Also, with the creation of Pinterest, I am sure there has been a surge in sellers on Etsy and I am finding many of them are selling what they see they can make from Pinterest tutorials. There is nothing wrong with utilizing Pinterest as an inspiration board, like it was intended to be used as, but you linked to specific pins and considering what you said in the above quote, I can only imagine you may use these pins like you would with patterns. I feel like I might be coming off like I am hounding you, but that is not my intention. I am just trying to say that you recognize that there saturation in regards to crochet on Etsy, but then you list things that I have seen a lot of anyways. Basically, I am trying to implore you to find your artistic voice. Separate yourself from everything you see on Etsy, Pinterest, and other sites and make things individual to you because that's the only way you are going to succeed on Etsy if you still have the intention to sell. I'm not saying you can't make amigurumi or coin purses, but make your own patterns and have your own style. Then I'm likely to buy from you.
I think if you make a good quality product, then the problem isn't selling it, but how to stand out in the ocean of crochet goods.
-Take good quality photos. If you have small items I suggest light boxes.
-Have a lot of products to choose from. I am more skeptical of buying from someone who only has five items versus 50. The person with 50 looks way more motivated to sell.
-Be involved with the social aspect of Etsy
-Try other modes of social media. Blogging, Facebook, etc. Just don't use your own personal Facebook for this though. I had a friend who owned a store and she advertised sales all the time on her personal FB and it was very annoying and I defriended her.