So, this is the deal. In this scenario, humans are unable to create an interstellar civilisation. They have tried colonising exoplanets the slow way, at about a quarter of the speed of light, but this is just too slow and meaningful communication or trade between these worlds is pretty much impossible. So, we need a method of faster-than-light travel, but the problem is, humans can’t invent it,
The reason? All the methods of “superluminal” travel that don’t defy the laws of physics, (wormholes, warp drive, etc), involve meddling with the fabric of space-time, which humans cannot achieve themselves in this project. However, nor I do not want it gifted to them by some more advanced, clarkean civilisation. So, how can humans achieve “faster-than-light” travel, without inventing it themselves or having to procure it from an alien civilisation?