The problem is probably me, I save a lot of stuff. But, Keep has become sluggish as a result. I'm not great at utilising tags, so oftentimes I'll just scroll through "everything" (sometimes narrowed by say searching for "images") and I have pretty decent visual memory so I'll readily find the thing I'm looking for just because things have the right shape (even text).
Notion is sluggish with embeds. It doesn't deal with the visual information I store very well either. This might be a Firefox thing.
Have used Evernote too, in the past. The problem with that is that it doesn't at all mirror my mental model of how things relate to one another. Granted, neither does Notion nor Keep.
For me, things start out flat (Keep) and then they nest (Notion) but I also have interrelationships, and need pointers between things. Sometimes, I just want to explore the "web" of how things connect but I've never encountered a system that affords me different "cameras" to explore my curated content.
I do not have the energy to build it though.