I currently use nextjs and prismic for my CMS - while there are some nextjs themes and starters, it’ll probably require some coding (which I enjoy!). A benefit of next is that it has incremental static regeneration, so can update pages without having to rebuild the whole site.
I’ve also used Sanity on pretty much every other site I’ve built and it’s fantastic!
I’m looking at rebuilding my blog from scratch at the moment - I kind of have a whole different purpose for it now. I’m looking at Astro instead of Next, and thinking about TinaCMS over sanity - partly to try something new, partly because the speed and simplicity of Astro with a visual builder writing markdown is exciting to me!