Brexit - the worst decision in history?

I think Brexit is the worst decision in history. The results of this decision will be seen in the near future. The UK economy will suffer a lot because of Brexit.  
What can be done? I'm afraid it's nothing. Let us not forget that Scotland wants to remain in the European Union.
 The only solution is to organize a referendum for the return of the United Kingdom to the European Union. I am afraid that if this does not happen, we will be witnessing the end of the United Kingdom.
 That is why I urge all those in the United Kingdom who love the European Union to organize this referendum.