All I have is old wallet.dat. How to i access my coins?

Hello I had an old laptop where I originally bought my sys in 2018 probably on blockmarket1.2.3. I put my wallet.dat on a usb and it is now on my new laptop. All of the guides I read make no sense to me. I tried to redownload old blockmarket but it wont even open and i get this message: “Error: Incorrect or no genesis block found. Wrong datadir for network?” Additionally, I do not remeber my passphrase I made in 2018. So my question is, can I even access the coins? Please someone help me I have been trying to figure this out for a very long time.