Hi all. I was hoping I could get some ideas from some of the members. I have 2 credit cards. A personal diners club card and a AA Amex card i use for business purposes. I do not travel much for work, my spend is 5k/month personal and 2.5k/month business on the 2 cards. I have accumulated 75k in AA miles,125k diners points an have 145k marriott points. I tend to use the points for air travel and vacations. I fly american the most, but also delta,southwest,jetblue on occasion. when i have stayed at hotels, they have been marriotts and have used Marriotts website to accumulate miles from retail purchases for business and personal. Just wanted to get some thoughts on better cards or combination of cards to maximize earning points.

Thanks an sorry for the long winded question.