Best CMS for selling books online?

I'm an experienced SEO/writer looking to start selling fiction/non-fiction books online. What CMS will be best?

I built my own website selling SEO/writing services on WordPress but it's just a pretty basic site with enquiry form + blog. I also pay for the business plan and don't really want to double that cost for the new site as it will really eat into the slim profit margin of selling books in 2022. This will be my fallback plan though.

I write fiction for pleasure and want to self publish a few books and sell them online, using my SEO and digital marketing skills to set up some semi-passive income. I'd like to sell both digital and physical versions.

Required: - Ecommerce functionality for online sales and payments, stock inventory etc. - Blog

Nice to have: - Forum/ UGC posting - Email automation

I had a little play with WooCommerce on my existing WP site but it's not as user friendly as I imagined. The cheaper and easier to use the better.

Any advice appreciated.