Welcome to FlyerTalk cotter77. I agree with Cholodewitsch about pairing your cards down to one, maybe two.

One way to earn miles, not MQMs, is to purchase dollar coins from the US Mint and then deposit them into your checking account.

Another option are the (in)frequent MQM bonuses offered by the airlines and or partners. Here is one from DL and another from Hilton. Both of these require registering before making reservations.

I am sure, as you continue to read through the various threads, you will find other ways to easily earn miles.

Good luck and travel safe!