While karaoke is incredibly fun, you won’t have much luck finding a job as a professional karaoke singer.

You may have better luck selling your work as a cover artist or cover band, but even that’s different from karaoke. You need to practice. Learn a catalog of songs well. Find gigs and take requests from audiences. Promote your covers. Yes, you may still be singing songs you like, but no, it will feel nothing like karaoke.