Best Practices for E-commerce Website Development

Hi everyone!
I’m currently working on improving the website for my webshop selling kilts. I’d love to hear from others in the community. What are the best practices you’ve found for developing a user-friendly, high-converting e-commerce website?

We’ve already focused on product photography and a simple checkout process, but I’m looking for more insights into optimizing site speed, enhancing mobile experience, or any tools/plugins that have worked well for you. Any advice on making our site even better for customers would be greatly appreciated!

Looking forward to hearing your thoughts!