Switching would NOT be an "upgrade". The fork that came with your bike was designed to provide optimal fit, handling, and ride qualities. If you bought the carbon fork that Trek uses for your same frame on different models, it would be a "side grade"...good handling, but less protection against damage.
Carbon forks originally became popular on racing bikes, because of a modest weight savings. Then, marketing "guru's" figured out that folks who will NEVER race assume that if something is on a racing bike, it is a "superior" product, and worth a higher price. So, they began putting carbon forks on bikes that are NOT race bikes, degrading the usefulness of the bike, but providing an excuse for raising the price.
Today, because carbon forks are on virtually all road bikes selling for more than $600 or so, cheapo carbon forks are made in "cookie cutter" fashion in Asian factories. At the wholesale level, many of them are really cheap ($20 or $30), a reflection of their "quality".
The best material for a bike fork is steel. Steel bends under mild stress, and then returns to its normal position. Under severe stress, steel will bend even more, but it can later be realigned. When a carbon fork is stressed beyond its limits, it does not bend...it simply snaps like a pretzel.