I have take a look at your store and it has a fair nice UI. Here are two tips helping you gain more sales on Shopify
Hope this do help!
Hey @Diagofernandez , Welcome to the Shopify family !!!
I must say you have some incredibly interesting items on your website, However, these are some areas which I feel needs improvement
1) The About us page needs to go on the header of the page Since About us page is critical in communicating the message and story of the brand it would be a good idea to put the button on the header section so that users can understand and relate to the emotion of the brand.
2) Adding analytics codes (like google analytics ) can help you understand the demographics of your target audience and this can really help you optimize your landing pages, and understand what social channels work best
3)Add a favicon to your website, it'll boost your brand recognition, credibility, and trust.
Suggestion: Add some kind of stickers to showcase stuff like trending, running out fast, back in stock, hot seller, etc. Apps in the Shopify app store can help with this by making the process very easy & simple. Also having some more trending or sale products on the Home page will quickly grab customer's attention.