Second this, having 1000ish assets through bundles or opportunity bought during sales, I don’t even know everything I have in my library, and it’s atrocious to search through.
For prototyping I usually don’t even bother using the assets I own, and instead use megascans where possible as they had decent meta tags to search with, or create everything from scratch.
Filtering based on file type and some broad asset categories is quite limited.
You can search for tags at least, assuming your search matches the tags the seller chose.
But if you don’t buy assets in a targeted manner for a project it’s quite messy, quality of assets may differ, varying themes and styles.
Personal ratings (& rating filter), folders or collections (perhaps even public collections, like sketchfab had) would be very useful, you could pre-plan asset folders for different projects sort into genres/themes etc.
Curators and curated themes similar to quixel environments (multiple individual assets bundled into a somewhat matching set) might be interesting, though that might have fairness issues if they are being endorsed or even just showcased on the primary storefront. (Which creators were added/passed-by in the bundle?).
*Note bundle just for categorization, you’d still have to buy the assets priced individually, but it would allow matching related items. E.g. if you own these fantasy swords, you may be interested in these medieval market stalls or these knight characters.
Subscribe to curators and themes you’re interested in to avoid UI clutter.
My 2 cents.