The UK went from the world's superpower to the world's clown (2016 mentions were Brexit).
The new superpower is clearly China.
The US will be relevant in a while, but china's GDP is expected to grow 10 trillion past the US in the next 10 years. They are also investing heavily in AI research, which is going to be one of the most important factors on who is going to dominate the world.
This is a good video on this. And you should subscribe to the channel, they made a new video concerning germany and its future. Good quality information concerning geopolitics.