Need help with an old bottle

Hi, idk if this is the right sub but I was looking for help with this. Years ago I acquired this decades old schnapps, the description shows it was made when berlin was still east and west. I’ve tasted an open one before so I don’t want to open it but I think there is a crack in the seal, I wanted to know if there was a way to save it from evaporating, maybe applying new wax?

I don’t have any experience with this or know if this is the right sub, can anyone here point me in the right direction? I really don’t want to lose it like this and don’t really want to open it.