First Time Central Europe Itinerary

Hoping to travel after graduating from college with my S/O starting end of September. Right now I just feel contradicted with itineraries because its 3-4 weeks and we are hoping to get a good mix of architecture / nature and there are SO many places. We want to thoroughly enjoy our time but understand with such a limited time we have to keep a certain pace and have landed mainly on Central Europe. Have a 6-8k budget, fine with hostels and roughing it. Potential routes look like Prague - vienna - slovenia / switzerland (i know slovenia is cheaper) - lake como. or venice, with what I've seen so far it would not be drastic to move into northern Italy. Not looking for a step by step itinerary but any feedback/ recommendations would be greatly appreciated!

Edit: also im half Czech, if anyone is wondering why we are starting there lol