Ignoring the massive cost, legal hurdles, and the opinion of the residents/government/outside powers, if you could magically grant independence to certain territories or form new bigger nations from existing ones with no repercussions to yourself, what new countries would you create?
Please treat this as a non-serious post, let’s not get into a massive political debate, those never end well.
Break away for sure. The California Republic would surely have its problems but far less than the US right now.
But really I’d like to see every country balkanized. Big empires are nothing but trouble. Ideally each city would be its own polity, and they can have regional compacts if desired.