I also built a 3D portfolio website[1] using React and react-three-fiber but I took a different approach design-wise, the HTML content is scrollable like a normal website but the 3D scene subtly matches the perspective of the screen as you scroll.
Btw that site runs horribly in chrome on a pixel 9. The frame rate is low and scrolling has lots of jank. Also the page width is just a little bit wider than my screen width, so there is horizontal scrolling as well.
nice site. one suggestion - it took me too long to realize I needed to scroll down to see your stuff. maybe a little ghost arrow pointing down might help others
[1] - https://samuelgoodell.com