Don’t always grasp your penis in the same way. Varying the position of your hands can bring some variety and make it more exciting: experiment.
Place your hand upside down (the thumb on the on the bottom or the top side).
Use three fingers (index finger, middle finger and thumb) instead of your whole hand. You can stroke the whole shaft, but also just go back and forth over the head.
Make a milking movement with two hands, first sliding one from the base to the tip and then the other. This is most pleasant when you use a lubricant or saliva.
Let your penis slip through your (wet) fingers instead of grasping your penis.