If Lewandowski (whatever striker you're playing) is struggling to score, try rotating between Advanced Forward and poacher
Try to play Marco Reus in AML as IF. other wingers such as Blaszczykowski and Aubameyang should be played as Wingers.
Get Marco Reus to take Free Kicks. He scores them quite regularly.
Focus on Defensive positioning in match training when playing big teams especially if the match is away.
Pre-season training should be set to fitness - Very High. During season it should be balanced - Very High