This bike was not designed with a suspension fork in mind, and the suspension forks available are not much of an improvement. A nicer rigid fork might be an improvement, as would a larger tire. (BikeMan.com is a good source for those forks.) A larger tire will fit better on a wider rim. Tubeless tires will roll better with lower pressure. A carbon handlebar can take up some of the chatter.

But if you start down that road, the purchases add up quickly. No matter how supple you make a rigid bike, it's still a rigid bike.