I get a lot of value from YouTubers who simple follow a consistent methodology of endurance or break testing products or materials. Tear downs and documentation of internals, performance statistics, etc...
Channels like CNCKitchen or ProjectFarm are excellent citizen scientists for example.
But a lot of low hanging fruit has been picked. (And that's good, that's how progress works.
Compare to how saving an additional life in the US is a lot more expensive than saving one in South Sudan. That's because people in the US have (approximately) already saved all the lives they can save for cheap.)
Nowadays you need intercontinental collaboration between research labs.
And that's not _just_ because of the bureaucrats.