Admittedly, I don’t know much about Brexit, but from what I have been exposed to, it seems like a decisively economical and political impairment that made travel and business with the rest of Europe more difficult and costly. Since it is so highly criticized as a terrible move, why doesn’t the UK just rejoin the EU?
Neither truly needs the other - both are hurt by Brexit but they’re both getting along ok without the other (although brexit was far softer than people tend to realise - aside from a few very major things the UK is still de facto in a lot of EU institutions, and not including issues caused by Russian invasions)