The weapons and artillery are already mostly finished, but im still looking for a setting
(the hundred years war is overdone tbh)
Why not something more homebrew? Games with their own custom setting and worldbuilding tend to gather very large and sometimes loyal fanbases.
30 years war?
It was a brutal conflict with many parties and a dynamic history.
Of course, the 1600s are not “medieval” any more by any stretch of the definition, but it was still a time of matchlock muskets, cannons and mainly pikemen.