It's time to turn up the heat way high, and make it required that to vote in the state, on must be domiciled there and nowhere else, be registered in one and only one Election District there no later than (30 days?) before the polls open, and be able to be identified by the clerk or inspector by verifiable ID (at least the same signature used for registration).
This is the way it used to be done.
To whom can we individually turn to? To a state senator or representative/assemblyman? One's party committee? one's Congressman or Senators? Who is going to coordinate out a mass protest against unlawful voting in a state? Across the country?
It does no good to complain about it if there is no mechanism to bring one verifiable voter/one vote back into play.