Trade gronk for what wide receiver?
Can you hold Gronk a week or 2? It’s gonna make whoever you go to very happy to find out you’re selling low on one of the best TE’s in fantasy.
I doubt you can get the WR you probably want right now unless you go after another high end buy low guy like Allen or, less likely OBJ/Julio/AB. Unless you go after Keenan Allen, you’ll probably have to add a sweetener.