I am having 4 credit cards and done the balance transfer. Can i apply one more credit Card?

I am having 4 credit cards and done the balance transfer. Now I need to pay one of credit before April. I want to apply one more credit card to do that. It is possible to apply one more credit card. Which is the best credit that gives me higher credit limit? When can I apply the credit card?|||your crazy for even having 2 gl with that one lol