The country needs a rethink and restart completely changing why people go into politics in first place. It's simply selecting wrong people.
Agreed, but PR is precisely how that can be achieved, since it cannot entirely keep out all the decent and sensible in the way that the first past the post system can be corrupted to do that. PR brings multiple parties which can only form governments by the consensus that gives influential voice to all opinion.
But PR alone is not the only solution to all our ills. A complete change in accepted economic opinion is needed to expose the myth that globalisation is the way forward for all.
It is not, it is in fact humanity's greatest enemy in multiple ways. China of all the most unlikely countries has realised that and is setting out to correct it. Japan too has realised it, and although for entirely the wrong reasons, even Donald Trump was unknowingly on the right lines when he promoted "America First" as a policy.
Indeed, even Brexit could have been a good policy to aim for
eventually, had it been by using the right policies and for the right reasons, instead of the spurious ones given.
.