No I'm not - EU is the least relevant big player on the global scale, economically and militarily - mostly because it's such a weak union of extremely diverse countries with weak common identity (as demonstrated by squabbles at any crisis - financial, COVID, immigration, etc.)
It makes sense for smaller countries like mine (Croatia) because of free travel, easier access to a larger market, lower cost of doing business, and truly being too small to negotiate good terms on a global scale. It probably makes a lot less sense for UK which can negotiate it's own terms with other global powers that fit them much better.
I have no doubt there will be many negatives to Brexit, but as demonstrated by COVID situation there's a huge opportunity for UK - for example I suspect they can secure better trade deals with the US without having to worry about the protectionist interests pushed by other EU members.
Which is exactly what is done with Britain. News item, queue "they get what they deserve". How about the EU gets what it deserves for being a undemocratic, big bungling bureaucracy?