It's your money enjoy it as you please.
Mr. Blue, as you were on the street for some time and it sounds as if you were able to make a buck or two. You of all people should know that money is to be used not frittered away. Once a person reaches a point in their life that their money is working for them and not the other way around is when the fun starts. I reached that point about 10 years ago, and it sounds as if you are also there, so enjoy life and the fruits of your labor. If shooting or whatever is no longer fun step away from it for a while, try something different.
As for donating time or money, which I believe is the right thing to do, there are many worthwhile charities that always need help, I would never presume to suggest to you are anyone what charity to donate to, but Remote Area Medical does wonderful things for our American citizens that need some basic medical help. Nothing fancy but good solid dental and vision care.
As for having to replace the rear tires on your M-3, a lighter touch on the far right pedal will make all the difference in the world.