Winter tyres

Hello together, My winter tires 205/55 R16 (Continental WinterContact TS860) have stood today VA 3mm and HA 4mm profile. Are driven in the middle mountains and 1-3x in the year on ski holidays. I know that the tires on the VA next winter have to be new. I wanted to drive them now until Easter and then dispose of them at the next change. But now – especially for sustainability reasons – I have to consider throwing the tires away from the HA directly with me. Just from now until Easter and October Experience shows that there is little snow until November. Do you think it is justifiable to make 2 new tyres on the HA in winter and then to renew the other tyres at the end of November/beginning of December? Or should I renew all 4 tyres directly to the winter? Does it make sense to buy the winter tyres now and store them in the dry, dark cellar until the winter? After all, even new tyres are already up to 5 years old… If yes, do you have a tyre recommendation directly? Important would be a long durability in combination with good adhesion. Liability, however, is significantly more important…