Our EU membership causes a situation where we need to have an immigration system that is unfair and racist - leaving the EU is an opportunity to put together an immigration system that is fair and not racist. That's not contradictory and it is a fact.
As for fixing the EU's problems from within they've had 40 years and laughed in the face of everybody who has tried - including Emmanuel Macron, the saviour of the EU. They won't change in another 400 years unless somebody leaves it who is bankrolling it and even then it's a crap-shoot. Delusional is the most polite word I can use to describe ideas like that.