I highly recommend Sanity, Vercel provides many high-quality templates for Sanity, it has free plan, easy-to-learn, App Router compatible, and you are able to customise everything through plugins.

My personal website also uses Sanity, you can take a look at it.

Thanks Fuma, for sharing your experience, currently we use sanity but still exploring more options for business blogging 😅

I also use Contentful, but Sanity is still my favourite one for now

Same here, love their developer experience and editor