Two things, and two things alone, can save your fantasy season now: smart trades and prescient moves on the waiver wire.
The former is an excellent way to patch up weaknesses by giving up players at a surplus position. The latter, however, can potentially net you starting players without costing you anything. So your top priority should always be nailing your waiver additions to improve your team and bolster your depth.
If you need a hand, I've provided my list of top players to add this week, along with a few guys you can safely drop at this point and two long-term sleepers I'm keeping close tabs on.