Gain weight, its the only way. Im on the other side of the spectrum. I have a 28 inch waist, my thigs and calves barely fit into a pair of jeans and my ass is huge (part ***).
Your could just strengthen your wrists instead of becoming reliant on using straps. Its upto you. I know if it was me I'd want to correct the problem and allow my wrists to work as intended.
Strength is relative the the person. Strength takes time, and the amount of time it take to be able to handle greater loads is also relative to the person. In a year and a half i have gained around...
This. As explained by Jason Blaha, you can use different exercises to hit a certain group of muscles, but its all about the amount of focus you put into doing the exercise