Permanence is my concern with the indie blog hosting services mentioned here (bearblog, prose.sh, nicheless.blog)

Also, because you already have a lot of the content, maybe you don't need a blog? what about a "digital garden" ?

What is a digital garden? -> https://maggieappleton.com/garden-history

Tools (easy options included) -> https://github.com/MaggieAppleton/digital-gardeners

If you have your content in a note-taking app like obsidian, there is even simple tutorials on how to freely publish it with all those precious "multiple tags per category", all in one go.