Understanding old results and putting them into new perspective has its own very important value. You should not underestimete underestimate it.
However, especially for a novice, it is difficult to judge this. Consult your reviewer and ask for advice. If an experienced and well-established mathematician sees value in your work, then you should try to publish it.
Of course it is an important and difficult question where. Not all journals approve of this type of synthetizing papers. Here again, the help of an experienced established collegue colleague is inevitable.
