Well this is depressing I made this account back in alpha and I barely played it since release because I was burned out from alpha. I bought the Archeum Founder Pack back then, and I still got 11250 credits along with some other random items. What are my options to liquidate the credits/items in my account for fg or other stuff.

maybe

Your best bet is probably buying superior reds off the market place, selling them, putting whatever you can on the AH and then sell your gold on here for FG.