It is partly a big-boy toy, so whatever you enjoy. I would personally upgrade by adding panels to the existing, running two or three panels in series (if MPPT can handle the volts) and make it work.
Nothing wrong with scrapping your panels and starting over with the 24 volt ones either. Someone will be happy to buy your used panel Im sure. Going new would make it easier to have your 3x200 as you mentioned and gives you more watts in the end.
Yes, having ample solar is good for those cloudy or short winter days, esp when you park and camp for more than 3 days at a time without any other power source.