It probably felt to Joseph that he was forgotten again. He interpreted the chief cupbearer's dream, encouraged him, ministered to him and then asked him to not forget him when Pharaoh put the cupbearer back in service.
Joseph was forgotten by the man. But he wasn't forgotten by God. God brought him out when the time was right.
Sometimes we will feel forgotten. And maybe we are by people who were in our lives.
But we aren't forgotten by God. He knows where we are. He knows the gifts He has given us. He will use us when the time is right.
Just stay faithful. Keep honing your gifts, your skills. Be ready for the opportunity will present itself in time.