Thou Shall Grip.
And rather than just train the strongest part of your grip to be stronger, train the weaker parts of your grip SO THERE ARE NO WEAKER PARTS!!
Also, seriously, people have an unaware habit of hooking things in their fingers and letting gravity do the work – that’s poor grip strength and leads to forearm problems down the road.
Make sure to grip things by rolling them deep into your palm. Then play around with which fingers you can lift and for how long.