Advice on what i should do

Hi all i currently have an asus rog strix laptop with a amd 8940hx and a 5070ti it only has 16gb of ram i know i need 64gb. but there is this guy on marketplace selling a desktop with a 5700x3d with 32gb of ram again i would upgrade to 64gb it has a rtx 3070 i would again upgrade that card down the track my question is should i upgrade my laptop ram to 64gb or buy this 5700x3d system to play. I cant afford to go to am5 and build from scratch and i have the itch to play.