I agree with Rick, though I do have one solution depending on where you live. Vibram has this bus that they are touring REI's and resoling boots.

https://us.vibram.com/sole-factor-tour-2017.html

If there is an event near you, you can bring in your boots and perhaps get them resoled with a better grip. They call it resoling, but what they do is grind down the bottom of the sole and glue on a new grip. It comes out pretty nice and they only requested a $20 donation to a local charity. I can probably figure out how to link some photo's of the finished product if you are interested.