Had Charles the Bold not died during the Battle of Nancy and assuming he wins the war against the Swiss, what is the maximum territorial extent you can foresee him (attempt to) expand towards in the future?
Sunday and Breisgau were pledged to him by the Emperor, and it is reasonable that he'll try to at very least vassalize the bishoprics of Verdun, Metz, Toul, Cambrai, Liege, and Utrecht which were enclaved in the Burgundian lands. He's meddled on Cologne before, and he has ties to Savoy in the south.
Might he try to expand to Alsace, or to the lands of the former stem duchy of Lotharingia (Trier, Aachen, Julich, Berg)? The northern unruly Frisians might also be a target.
Perhaps he wants to spread further south to the actual lands of Burgundy(Dauphine, Lyonnais, Provence) or perhaps subjugate the Swiss? Or might Burgundy go after more French lands, like Champagne or Normandy?