Your store looks very inviting - I love the theme colors and the fancy title fonts. I understand why you'd want to combine the cat products and music products, however you'd earn more authority and trust by specializing in one niche. People will feel more confident buying from you when they see you focus and specialize in one niche. They'd feel they can trust your expertise more.
Also, make sure to be consistent with your collections - for example you have a pupyy collar https://www.bflatcat.com/collections/for-cat-lovers/products/piano-puppy-collar in your cat's collection.
Your About us page is excellent - you build trust by telling what inspired you to open this store; perfect. Consider also adding a photo of yourself [or anyone involved with making the store] to build a rapport and trust further.
Refund policy - consider writing a unique policy here instead of featuring default Shopify policy, which mentions items you are not selling:
It will help you build trust, tailor the content to your own store and avoid any duplicate content issues, which might affect your Google rank.
Shipping policy - consider adding this page with a table with the delivery rates at the top, so people know right away how much you are charging, and whether you ship internationally or not. Many online shoppers often look for this info before placing an order, to find out the shipping cost, so having a detailed policy can also help you boost your conversion rate.
Contact us - consider adding this page as well. It will be much more convenient for your customers to get in touch with you, then to copy the email address from the footer, go to their mailbox, paste it and then email you - it’s quite a drag to do it for online users - which might affect your conversion rate. Make sure it’s easy to contact you and people will be happy to get in touch to discuss their custom orders.
Consider using page.contact as a template for this page in your Shopify admin, so the contact form is displayed automatically. This way people can contact you directly from your website.
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Shopify SEO expert
Rock Paper Copy