Hah! This is me. I bought an Arduino and a ton of components and I pretty much stalled out at blinking LED. I also watched all of Ben Eater's YouTube videos on building an 8-bit computer from simple ICs and then bought all the parts to do it and never put it together. I realized that I'd already learned how it worked from the videos, and putting it together would just be rote work that I already knew the outcome of. I tried to think of some practical reason to do it, or some modifications I might make, but then I moved and never unpacked the stuff.

Hah. That hit home. But now I have a kid and we are slowly starting to delve into things. It is oddly fun to explore this realm together.