I am with the others that say, put some faster/lighter tires on this and ride the heck out of it. Learn how to do maintenance and think about what you want in the future.
Even buying ebay/etc it will cost a lot to upgrade and there will not be much gain either performance wise or weight wise.
Save the $$ and do n+1...get another bike in the future...maybe a road bike or gravel bike or??? depending on what you want to do, The trek 7300 is a good hybrid, use if for the good that it is.
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Life is too short not to ride the best bike you have, as much as you can
(looking for Torpado Super light frame/fork or for Raleigh International frame fork 58cm)