6.5% on a mortgage? You know the mortgage rates are down? We are currently refinancing again to lower that 3.5 %. We thought just under 4% a few yrs ago was great. Look into a no cost refi and pay down. Our refi is less than $500 total with perfect credit.
Our payment goes down $115/month and you can't rent a quality 1 bedroom apt for what our mortgage is on our 4000+ SF house. Our payment is less than $1000 a month. We don't do escrow, we pay our own taxes and insurance.
If course, if you have other outstanding debt, clear that out, then make sure you have an emergency fund ( preferably 6 month stash minimum)
Then invest. Many accounts don't have a $50,000 minimum, many do have a $10,000 minimum.
If you are new to investing, don't jump in without knowing what you are doing. At least get some guidance.
Add to your children's college funds as well.
Good luck