Eventually they did, in a roundabout way. The rise of the US, causing Britain to lose its lucrative colonies (and the future potential value of their North American holdings), helped break the British Empire. They could not sustain their empire with its shrinking assets. Empires bloat, ossify and become more expensive to maintain over time. To counter that, you need an outsized injection of new value coming in, which the North American colonies could have potentially provided. At best it might have bought the British Empire some more time.

In this case fixing means returning Britain to being a normally functioning nation state, instead of an overseas, overstretched empire.