Jacobi Myers. I looked up FA WRs today and it's not impressive at all, Noah Brown is Top 10. Not bashing Noah, I like him.
Mercole Hardmen, Parris Campbell, DJ Chark, Allen Lazard, Mack Hollins, Deonte Carter...etc. If you're like me and don't want to burn much cap on WR these guys should low cost WR3 types.
Dallas has a lot of WRs coming back that could take a leap in: Simi, Tolbert, Houston, Drummond, Callaway (?), and Brandon Smith. Then you have the draft, so I'm more concerned about other positions.