“We could just made a vaccine from the cold virus ?”
No, we have never made a successful vaccine using/against the cold virus (really the coronavirus strains of “common cold” type), because we just can’t do it. By the time you could manufacture a potential vaccine, the coronavirus would have already mutated into a different form and your vaccine would be ineffective.
Which is also one of the reasons that the vaccines against COVID were doomed to fail.
Which is also one of the reasons that the vaccines against COVID were doomed to fail.