#5 Playing Marcus Rashford as a striker
Sometimes the answer is closer than you think. Perhaps the best option for Jose Mourinho would be to alter his playing style, even if it means dropping Romelu Lukaku to the bench.
There is a wealth of attacking options in this Manchester United side. Should Marcus Rashford give up his spot on the wing, then the likes of Jesse Lingard, Juan Mata, or Alexis Sanchez (temporarily) could benefit from playing there.
Marcus Rashford has saved United many times during his short tenure with the senior team. His pace on the ball will give United the option to play through balls for him to chase, something which has been of benefit on the flanks. Paul Pogba is able to produce these deciding balls, as well as Juan Mata.
Should Jose Mourinho rely on Marcus Rashford to play the striker role, rather than searching elsewhere, then Rashford will be full of confidence.