Sir, check out my thread in the college football or nfl forum to see what I have done money management wise.
If you have increased your bankroll 5X what you are starting, then I say you look at as if you are starting over, and do the following:
Wager 1% to 3% of your bankroll now on all your wagers, parlays 1% and straight up bets 2% and 3%. So say your bankroll is now 1000$, 1% or 1 unit is 10$.
This seems like a small amount to bet when you have a large amount of money, but the truth behind the matter is that betting large amounts of your bankroll is how 90% of people lose their money and bankrolls. You do great for a while, build your bankroll then blow it all on one game. The books love bettors like that, hence why they can afford to give out 20% bonuses to newcomers, because they know the money will be theirs again sooner or later whether or not the bettor wins 1% of his games or 90% of his games.
Build your bankroll like this, and once you have doubled your bankroll again (so in this case to 2,000$), then double your unit size. It is still 1% of your bankroll but now it becomes 20$.
I started with 8,000$ and using this method have doubled my bankroll four times in six years, turning that 8,000$ into what is now 131,000$ approx.
If you wan't to make money, this is the way to do it. Though you still need to win your picks, it is much easier this way, and it takes a long ass time to lose your bankroll if you are having a bad streak, so you're not charging your credit card for more gambling money every weekend when football is on.
Do not put all of your eggs in one basket.
I hope this helps, if you choose to go a different path then I suggest doubling your unit size each time you win your bankroll.
In this case since you have won your bankroll 5 times, you should wager 5 times you were at the beginning when you deposited your money. Hoping you are wagering 1-5% on all games however, or that money will be gone sooner than you think.
GL