It would be helpful if you specify the make and model, so people can assess whether the tape would be playable on a machine they own, which may have individual outputs. They could then transfer the material for you.
Your location (country and area) would also help. Someone may be near enough to assist in person.
One (long winded) way you could transfer into Cubase using your machine is to play each track in isolation (assuming that’s possible) then time align them in Cubase.