Can i restore my litecoin wallet?

I created a litecoin core wallet, reinstalled the program and the litecoin account changed, can you restore it if I know its password? (i dont have .dat file)

If you have your private key or seed phrase you should be able to restore your wallet

what exactly do i need to do?

You should be able to follow these instruction, I believe it is the same process for BTC core as LTC core for importing private keys through the Litecoin Core QT Console