Teen making my first ever e-commerce store. I know it looks awful, but what can I do to fix it?

Hello everyone,

I just opened up my first e-commerce store that dropships fidget toys. The URL is https://www.funstresstoys.com/.

I'm doing tiktok advertising and trying to focus there as it is my target demographic. I made my first video about 3 hours ago and it hasn't gotten much traction, although I have been told that tiktok recently updated their algorithm and now it takes a few day to start appearing on the FYP.

What I'm concerned about is my actual website design. What can I do to improve it? I am using Shopify so luckily most of it is easy to change.