Sometimes when you have a problem, the best way to eliminated is to do just that, eliminate it. But if your problem is you use too much of your credit limit every month and have a hard time paying it back, eliminating your credit isn’t the best option.
If you ask your bank to lower your credit limit thinking that it will be a good deterrent from going buck wild with that magic free-money card, just take a step back and think about the consequences that action might have on your credit.