You might start here by looking for visual patterns for Black to pursue. The key thing to notice is the spread of pieces on the second rank and especially the White bishops there. Of course there are pieces between them, but if the queens were removed a double attack would be possible; as usual the second rank is a great place for a fork because it can’t be defended by pawns. The bishops there are especially nice targets because unlike the White queen that also is there, they wouldn’t be able to strike back at a rook that jumped between them.
So Black goes to work to get rid of the obstructions, starting with the obstructing piece that he can control: his own queen. Experiment with exchanges. If Black plays QxQ, White plays RxQ. Now only the White rook would prevent a fork of the two bishops. Can it be taken? No. Can something it protects be taken? No. But can the rook be threatened and perhaps driven away? Yes, with Bb4. White moves the rook so as to avoid BxR; and now Black plays Rc2, attacking both of the now-loose bishops and winning one of them.