What do you like to print? I like making useful things. Currently Im working on a system for mobility aids to attach items like phone charger batteries and cup holders... and my ham radio!
I also make fun things to give away. My day job has an animal mascot, so I found a low poly version and printed it in company colors and gave it away to my coworkers. My "last meters" type prints are usually functional, but fun. Book marks tend to be popular (link )