Candied or regular LED tails, esky rack, color match lower valence (the grey part on the bottom of your front bumper), and by golly remove the stickers, or at least organize them!
I'm not one to vote for solid, one colored trucks, as you can see. Keep the chrome.
If you include sound in exterior, then consider a cold air intake and catback exhaust, and headers if you've got the budget.
Your truck is your canvas, what defines what you do is part your creativity and part your budget. The big things on this forum seem to be swap all bulbs for LED or HID (headlights), color matching, chroming or dechroming, esky rack, esky vent caps, and wheels.