Like you, my hands have been tools that I used and abused for decades. The damage of arthritis is not reversible, but it can be mitigated. There are several things I do that each in its own way helps.
I wear tight fitting gloves when I am doing something that involves vibration or shock, such as chainsawing or hammering.
I take meloxicam, a prescription strength NSAID that helps.
The biggest game changer has been the use of CBD oil. I get mine from this place. Spend the money for good stuff, not cheap crap from China.