One small tweak that helps me relax my grip is noticing when my feet are doing the work. Try it next time. Really connect with your feet.
Start by grounding yourself to your body by taking a couple of deep breath (square breathing is my favourite). Make sure you move slowly, and really feel the connection of your rubber with the hold, volume, wall, rock...
Climber often overlook the power of mindfulness in climbing. But connecting body and mind for any sport or essential for performance. In climbing, it's a powerful way to achieve the flow state.
What’s one thing you tried recently that felt easier on the wall?