I've been trying to solve the games up on the shelf thing with anthology books like
https://www.geeksline-publishing.com/12-our-books and https://www.amazon.com/gp/product/1526737795
So for each system I have a book like that and a flash cart or whatever the lowest impact hack is with every game ever published in North America on the system.
The good ones are pricey, but so is acquiring and storing a large cartridge collection.