Must be a different Rosario. The other one died over 30 years ago. He was a member of another Chicago Outfit ...LOL. Are you an EPIC guy?
If you spent 35 years on CBOT floor I reckon you have all you still need to trade. There's not much new under this particular Sun.
If you're currently cash-poor, check out brokers that do mini or micro lots. Going back to selling mug premium is always going to be good business and you could still potentially make good returns if your skills and instincts are intact, but without the dynamics of the floor, even with pro feeds, you're likely going to find it a different ballgame altogether. And you're obviously going to need to rake up some handsome returns trading vanilla before you can get enough clout together to start selling premium again. Can you bear the thought of that?
Have you traded off floor since leaving CBOT?