The founding fathers explicitly did not want a national WTA system. It made the most populous states too powerful - hence the electoral college.
Since 48 states and DC have opted to allow their voters to select their electors, the WTA approach has descended to the state level, along with the fear that founding fathers had. The most populous areas within a state are too powerful.
I believe in making every vote count and to most accurately reflect the will of the people.
The best way to do this is to apportion the electoral votes on a district-by-district basis to the winner of each district. One vote per district. The remaining two electoral votes can either be given to the winner of the popular vote within the state or to the candidate who won the majority of districts in the state.
The will of the people within a state, either blue or red, is better served you this method. It makes the votes of citizens who live in districts dominated by the opposing party truly count. It encourages those citizens to vote since the electoral vote of their district will go to their candidate - even if their state is solidly for the opposition party.
Of course, this will require a constitutional amendment to do so.
To make every state do it would require a constitutional amendment. But two states already do it, so you can get legislatures to do it on a state-by-state basis without the need of an amendment. You might not be successful at that, however.
Remember, in the beginning, the legislatures chose the electors. They exercised their best judgment and were not bound in the same way they are now.