The wallet comes from 2019, i never transfered any funds from it, so i never typed the password ever! It just contained one adress!
Therefore i never ever exposed my private keys!
OP you are not active for a while but if you ever comes online, I would like to know that you find out what is the reason behind the hack?
First of all I suggest you to check that address got balance or not using any bitcoin explorer, if exists then it is due to sync problem with nodes, if not then you need to find out which caused the password of your encrypted wallet dat file to be exposed.