In theory, you might make some small gain in weight and ride quality from a well designed CF fork,

But finding a high quality one for 26” with v-brake/canti bosses could be an issue. Also, is that a 1” or 1-1/8” steer tube?

First place I would start is running bigger tires. It is really a matter of what your fork and brakes will clear. Are those 2.1s?. If so, going up to a 2.4 with appropriate drop in tire pressure will make a world of difference, more than any CF fork will.