I am unable to find a similar vibrancy of themes for static sites. Forestry.io showcases (https://forestry.io/showcase/), some beautiful websites as examples of what can be done. However, I cannot find themes that can be picked up and built like the showcased examples, without hand-coding or going through an agency to create similar high-quality static sites. For example, JAMstack themes (https://jamstackthemes.dev/) has some templates, but most of them lack quality and finesse.
Any help on where one can find good quality static site templates?
For a personal site it might be worth it to create your own layout.
For a commercial site, maybe hire someone to fix a theme for you?
Otherwise ThemeForest might have something decent, https://themeforest.net/
echoing the other comment: with the caveat that i've always had a basic familiarity with css/html, i wound up throwing everything out and just building my own theme up from scratch. the real headscratcher is figuring out the whole grid/flexbox div positioning stuff, but from there it's not super tough to look at website source code for ideas, and/or google around.
it kinda seems like you're shooting for a solution in which you'll find exactly what you're looking for without having to pay a designer or even put in some time on google. in my opinion, learning css was far easier than learning how to properly maintain a static site - so it kinda threw me for a loop. on top of that i'm not really sure what you mean by 'quality' and 'finesse', except that from all possible existing designs, i can safely exclude 'most of the ones of jamstackthemes.dev'