I need serious help!

I have no rb1 and my team is struggling in my ppr league. I have QB: Rivers/Cousins RB: Duke Johnson, Marlon Mack, L.Blount, M.Breida WR: D.Bryant, K.Allen, M.Crabtree, D.Jackson, D.Funchess, TE: H.Henry. I started the year off with David Johnson and dalvin cook. I really want Melvin Gordon but I don’t know who to trade. The guy who has him needs help at wr but doesn’t have much running back depth (J.Howard, I.Crowell and M.Gordon). Also his qb is jameis Winston. Any trade package suggestions?