I'd consider the entire country changing to what Maine and Nebraska do: 1 EV per Congressional District and 2 EV per state.
But, I think it would require some standardization for drawing district lines, to reduce gerrymandering.
Both would require a Constitutional amendment, because CA, NY (and TX!) would never do it voluntarily.
There may be more equitable ways to apportion EVs within a state, but my main contention is that I DO NOT WANT 20-25 highly populated localities in this country deciding everything for the rest of this country.