How to best organize user research across all studies?

We're currently reconsidering the way we've archived/organized our user research, not for a single study, but for ALL previous studies. Our organization is very large and silo'd (including the user research team) based on 5 different 'experiences' on the site. We've found that there's great research findings on topics that cross experiences (e.g. 'search', 'navigation', 'icons', etc.) but that information is buried within an experience.

I'm thinking about things like defining and tagging user research based on topics to offer an alternative way of organizing those findings.

What have others here seen that has worked well in terms of organizing a broad set of user research studies/findings?