i would say Florida, Ontario and the Maritimes + max Maine border claim on top of what they won OTL, it depends on the competence of the negotiators though.
Florida is going back to Spain. That's not really up for negotiation (as the French and Spanish would not have allowed it).
The Franco-American Treaty of Alliance had explicit terms as to who would get what in the event of maximal gains, with the US only claiming (in addition to the 13 Colonies) Canada and Bermuda as areas of interest, while leaving the rest to France (and implicitly Spain and any other allies who joined later). Bermuda isn't in the cards unless the US captures it (which requires an earlier POD), but they could certainly get more of OTL Canada.