How do I get my credit score back

[Nathanael D Caldwell]

Hey, looking for advice, I signed up for auto pay on my mortgage to my second investment property and left the country for a couple months for work and somehow the auto pay did not go through. I caught it at two mortgage payments past due, one at 30 days and one at 60. (This was back in February)

Before this I had 720 and its now down to 595. 

Any suggestions on how I can get this fixed I just purchased a third investment property for cash and I want to refinance it to get my cash back but cant with my current credit.