If you love trading and still have a working system, I would say keep it. But, heres what I do, take a lot out and start working the capital up again. I trade hogs in the CME pits exclusively and make well over my account balance every year, and every time it gets over $75k what I started the year with, I withdraw the $75k and work it up again.
So, my recommendation is to withdraw profits everytime you have a winning, and don't trade with everything you have. It's kind of like a don't have all your eggs in one basket kind of ting. Just trade with 500k and build it up again and take out profits.