Note - you should not be hosting purely static sites with Workers, if you can avoid it, give CF Pages is actually free and unlimited (assuming you don't use "Functions", which are just workers in disguise).
I am paying $0 for this worker for years now.
(Actually multiple, one for each domain)
Actually if you even search "static sites" now it just takes you to Workers & Pages in the dashboard.
Docs:
https://developers.cloudflare.com/workers/
Free plan limits:
https://developers.cloudflare.com/workers/platform/limits/#a...
This advice is a few years out of date
Pages are now essentially deprecated and Workers have dedicated ways to host static files and are the recommended path going forward for static and dynamic websites