Should I take the full time offer until I get fired or leave on good terms for J3?

Basically got a Full time offer instead for my J3 after contract ended. Should I do full time and get the money until I get fired or should I just end the contract tomorrow. I am positive I cannot take the workload and even when I was contracting I could barely keep up the amount of work while onboarding. I probably won't care if they blacklist me but just want thoughts.