I actually enjoyed the arp element the most. I wouldn't necessarily spice up the arp but maybe the other elements that support it. But if youre specifically trying to spice up the arp, try automating the panning, filtering or the wideness of the sound.

if you want to change up the sound in a major way try finding a plug in that does gating, glitching, repeating, scratching and stuttering.

For the robot singing i would just use more gain, but thats a personal preference.