You learned a few things:
1. Complete supers of frames with stores or at least have all the frames with stores grouped together.
2. Need to do more practive varroa control, ie sugar shakes during the summer to keep the count down to have more healthy over winter bees.
3. Local stocks will do better in cold temps that warmer climate bees.
4. Too much open space can be deadly, if it doesn't harm the bees in one way (too much space to warmor to allow moisture to congregate) it does in another (unable to reach stores).
5. Subspecies can be an important consideration, get cold weather bees for cold climates (Russians or NWC).
6. One hive puts all the hopes in one boat, with 2 hives there is a better chanve of saving both.
So get yourself a couple of packages or nucs ordered and begin anew, you at least have some drawn combs to give them a boost from the beginning.