The biggest issues we face - climate change, globalisation, tensions with China/Russia/middle east, migration, ageing population - will not be solved by either of the UKs political parties
No one, not even the most ardent labour supporter would suggest any of that (demographics excepted) is solvable by their party of choice.
There has always been tensions with Russia and China, certainly in all of the post war period, as we have also had in the middle east too, these aren't new problems at all.
It will take international agreements so solve these issues, which at the moment the UK is very weak on, removing us from the worlds richest trading bloc also removes the UKs influence.... note Xi visited the EU & didn't come to the UK.
Allowing 750k migrants into the UK, which the Tories have done, is just going to make the the population challenges the UK faces even worse.