Let's see: 47% of UK GDP depended on trading with nations less than 2 hours flying time away, and in many cases less than an hour away, or 90 minutes by ferry. Australia and New Zealand are... oh dear. On the other side of the world. But there's good news: Europe only has 450 million people to absorb our goods and buy our services, while New Zealand and Australia have... 32.5 million people.
OK, maybe this isn't looking great, which is why even the UK Treasury admitted that the trade deals cobbled together "won't make any meaningful difference" to UK GDP. Throw in Canada (maybe, after a suitable decade or so of negotiations) and we're still at a miniscule fraction of what the Brits lost by waddling out of the EU, and Canada is on the other side of the Atlantic.
It's easy to pretend that Brexit wasn't a catastrophe, but the real impact isn't economic. The real impact from surrendering to mindless soundbites and blatant racism is a society that is looking backward and has fixated on little englander prejudices, a nation that's normalized lies (fat Boris gets away with Trumpish nonsense) and thinks mediocrity is the greatest thing since lard-fried fish & chips.
Britain is a squalid little place now, with dreary minds and dreary weather, a place where run-away-and-hide-under-the-bed takes pride of place next to inane self-delusions. Backward with Brexit Briton is a place clever educated people will be leaving in droves over the coming decades, just as was the case with the brain drain of the 1960s and 1970s. And frankly, having voted for fat Boris and his disgusting band of halfwit Brexiteers, the Brits deserve everything that's coming to them. The idea that we've seen the worst of Brexit and the future will be fractionally better is hilariously delusional.