How can I improve SEO for my online store?

[TE96]

Hey all, could someone with good experience with shopify take a look over my store and give me a few tips to what I can do to make it better please? I'm using Google ads, fb ads and pinterest ads, however I'm getting no sales and I'm wondering why.

The link for my site: https://www.lucidshine.co.uk

All responses welcome and appreciated ❤️