The recommended retail price and the spec list identifies this as really a low-end bike. You're starting from so low that there's really not much sense in spending any serious money on improving it.
Things that are borderline worth doing:
If you mostly ride roads you might try getting some smoother tires.
if the saddle isn't agreeing with you, you might try another one.
Some Kool-Stop (a brand) "Salmon"( a model) brake pads might improve braking.
Apart from small stuff like that, keep it lubed and adjusted and put any "upgrade" money aside for another bike instead.
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