You've just written some predictions there. Not facts. The facts show that almost five years after the vote the UK is generally performing on a par with the EU and a year after leaving we are generally outperforming our peers - needless to say the pandemic makes a proper analysis impossible but you can only go on the facts at hard.

This isn't what was promised by the 'Britain Stronger in Europe' case which predicted house price crashes, rising unemployment, a stock market crash and an immediate recession.

All nonsense. There's an analysis of it here.
https://www.spectator.co.uk/article/...aged-the-worst

I really don't know why people keep harking back to a time now more than five years in the past. There's pros and cons, sure, but just focusing on the negatives will just mean you don't see or exploit the opportunities and will grow increasingly bitter. Times have changed.