1) Don't do everything your AM advises - e.g. if you're 5-0 up and he says you can't get through their defence, he's talking b*ll*cks.
2) Check if you've got any players in their last year of contract, and re-sign the ones in your 1st XI. I had a three-season hell period which only ended when I started re-signing players earlier in their final year...
3) Change your starting XI occasionally, practice a little squad rotataion, particularly if you're up against weaker sides - starting the same XI every match leads to some sort of toxic shock syndrome which causes them to under-perform.