FORSCAN -- will let you do a bunch of neat stuff; temp readings over gauges, minor tweaks to the 8” display, auto-fold mirrors, etc.
Tunes. Raptor and F150 stereo in general sucks. Huge. the sound is muddy and imprecise. on the ’15-’17 Sony it was a little easier and cheaper to mod, b&o is much pricier to upgrade. That said, about ... what? $2k give or take should get you a much more accurate and precise sound, loud enough that you can make out low volume rhythm or choral sections with the windows down at highway speed.
Fog light kits for the bumper cut outs. Lots of options here and lots of supporting vendors to help out.
Traction bars or torque arm ( group buy for the torque arm ends today, see link below.)
The Rap suffers from huge wheel hop / axle twist.
Tune or pedal commander if you don’t want to risk the warranty. pedal commander just ups the throttle signal to make the truck think you’re feeding more throttle. Makes the acceleration vs. throttle input a bit more linear.
Off road gear. if you think you have enough, you don’t.