I think we would do better to just expel the big cities. In California, if LA and San Francisco areas were out, Republicans would likely govern. Same in Oregon andWashington state. Even New York outside of NYC area would prefer conservative government.
You are absolutely correct. There are no blue states only blue cities that control states that would otherwise be red. And honestly I believe most blue cities are blue due to rampant fraud. Fix the fraud and you fix the country.
I have often thought the electoral college should extended down to county level. This would give the massive land area of say CA a chance at representation outside of LA and SF. The electoral college should apply to all voting inside the state as well. Gun control? Put it to the people with each county acting like a state in an electoral system. These blue states and all their nonsensical rules would disappear.