#2 Adopt a different style of play
Ever since their defeat to Brighton, there has been a change in the style of play from the team. In their defeat to Spurs, although they lost by a 3 goal margin, they were the better side going into the break at halftime. Had they buried the chances they got, it would've been a different story.
Even in their Burnley, Watford and Young Boys games, they didn't sit back after scoring a goal, they rather went for the kill and pressed the players until they got the ball back. This has surely caused a positive atmosphere among the fans, who applauded the players and the coach even after losing 3-0 at home.
Surely they aren't perfect, but with such subtle changes to their playing style, they can go to heights they haven't achieved under Mourinho.