A majority of Americans have opposed the Electoral College for a long time.
This is one way to end it. Text is mostly adopted from here and here.
The President and Vice President shall be elected by the people.
The electors in each State shall have the qualifications requisite for electors of the most populous branch of the legislature of the State; although Congress may establish uniform age qualifications.
The times, places, and manner of holding this election and entitlement to inclusion on the ballot shall be determined by Congress.
The persons having the greatest number of votes for President and Vice President shall be elected, so long as such persons have a majority of the votes cast.
Congress shall by law determine a runoff procedure to handle the case in which no pair of candidates has a majority, provided that this procedure is consistent with all of the preceding clauses of this section, and that any runoff election includes the two pairs of candidates who received the most votes.
Congress may by law provide for the case of the death or any other disqualification of any candidate for President or Vice President before the day on which the President-elect or Vice President-elect has been chosen; and for the case of a tie in any election.