Welcome, JustJayMusic, and my sympathy on losing your mother.
Be warned: you will probably get a lot of posts telling you not to pay down your mortgage, but instead to invest that extra money in index funds. Financially, if you can make 7% (average stock market return) on an index fund, you're better off than making 4% (or whatever your "pretty good rate" is) paying down your mortgage.
That said, I understand that sometimes maximising your expected return is not the highest priority. Whether accelerating the payoff is a good idea would depend on a lot of factors (your situation in life, your other savings, you income and spending, etc.). You may want to post separately, or even make a case study, for detailed advice on that question.
To answer your original question, sorry but there is no cool solution. It's the same for any loan: you pay it off faster by paying more than the required payment. Make sure you indicate that the extra payment is payment of the principal, otherwise it may get counted as an early payment (which means it will be credited against interest too, not just principal). You can add a little bit extra to each payment, make an extra payment each year, make a larger one-time payment, or any combination. You can create a sort of gimmick for yourself, and designate a particular category of money for the purpose, such as your tax refund or your year-end bonus or the amount you save using grocery coupons. There are lots of online mortgage payoff calculators that can show you how much difference this makes to your payoff date and total interest paid.
