Ohh nice! I really enjoyed setting up my site with 11ty, but also had to learn a whole bunch of stuff that Wordpress automates for you. Haven't used a CMS for it yet but I've been wanting to try it out.
btw. I read your blog post on the rework of your website. I've followed a similar path, and my last couple of sites where often 11ty with Netlify for static site hosting. I use a headless CMS like Contentful if necessary. good job getting your site off of WordPress 😃
this is one of my 11ty sites: https://github.com/trsi-group/trsi.org-11ty
Discussion
check out my code. it is pretty straight forward. and Contentful has a free tier for up to 10 members in an org.