How to reverse copper electroplating?
The galvanic cells from the same material are possible. They are called concentration cells and they use two electrolytes of the different concentration of the same electrolyte.

But their voltage is low. In the case of $\ce{CuSO4}$

$$U = 0.0295 \log\frac{c_1}{c_2}\ \mathrm V$$



Note that the electrode naming is based on the direction of the electron flow, and their mutual polarity are switched for electrolysis versus cells (primary cells or by convention discharging mode of secondary cells ).

Anode = electrons flow upward (anabasis), an anode is the place of oxidition. (Xenophon, Anabasis, "The way upwards")

Cathode = electrons flow downwards, a cathode is the place of reduction (katabasis - the way downwards)

During electrolysis, the anode is the positive electrode and the cathode is the negative electrode.

During the cell discharging, the anode is the negative electrode and the cathode is the positive electrode.