What can I do to improve my fantasy football team?

You need a lot of help at running back. Try to pick up somebody there and drop one of your WR's like White, Brown, Porter, or Hackett. All of those guys are expendable. Also, with one or more of these guys, improve and get a better WR, maybe via trade if there are no free agents worth it. Maybe try to trade Palmer or Gates for a better RB or WR. Scheffler is going to be good this year, so sell high on Gates if you can.