Don't waste your $, you have way more than enough with the equipment you have. Get a decent ball and learn to manage the course. You can buy all the equipment you want, it's not going to help if you don't manage your way around the courses.
This means playing from the fairway, not pounding the ball as far as you can and dealing with whatever happens. By your stats you can't get up and down from sand or rough and it takes you a minimum of 2 putts to get off a green. New equipment isn't going to fix that. Playing more than once a month will.
You have to work at learning this game, you can't buy it.