I like where you're going here, and the only things I disagree with are the Senate merge and Electoral College as these still serve a purpose. The removal of the House cap will rebalance there, and if anything the Senate could be reverted from popular election back to being appointed by the State Legislatures so they rebalance back to being actual actors for the State as intended vs overpowered Representatives.
The Electoral College helps balance democracy being 2 wolves and a sheep voting on what's for dinner, but maybe get some math experts to review the equation for apportionment and/or set all electors to be proportional to the vote percentages in every state.