The popular static site generators all accommodate very large sites. Which is great, but it can them very time consuming to learn if all you want to do is throw up some blog posts.

Writing a small static site generator for a personal site can be done in an afternoon, and it's fun.

Nanoc fills this niche quite well. It's more of a SSG toolkit than an SSG.

You build a Rules file with steps for each of your file types and it loops through and builds your site. It comes with Markdown out of the box but you can make it do just about anything.

https://nanoc.app/

Updated to clarify that it is the time it takes to learn and the upkeep over time that I find not worthwhile.