You should consider keeping the domain name, but moving the hosting to something free, like the herokuapp you’re using for the editor, or github.io. I have a domain name I own for sandify.org (I pay google to manage the domain) and github.io does the hosting for free. I am not doing any server side stuff on the websites I host that way (no logins, or server computation).
Another example is docs.v1engineering.com, We store the markdown in github and use the github actions (Their CI stuff) to “build” the html from markdown and then it gets served on github.io with a custom domain name. Except for paying for the domain, the site is free (I think, Ryan manages it).
I’m not an expert, but I’ve fumbled through it a few times. I think the first step would just be to make a new site without the domain, but move all the content over. Then you could move the domain and let the wix thing expire.