Equipment setup for new karaoke biz

So I’ve recently started my own karaoke (KJ) business as a little side hustle. So far so good, I managed to sign a few regular bar nights as well as some Halloween and Xmas gigs.

I thought the equipment I purchased was pretty respectable, however have had the occasional negative comment on the sound quality. The most common complaint is that singers can’t hear themselves.

I’m hoping I could get some pointer on my set up as well as any suggestions of other equipment that might lead to the ultimate karaoke setup:)

See pics. I have a PROfxv10 as a mixer and a pair of QSC k12 speakers. I have line 1 going to speaker port A, line 2 going to speaker port B. The speakers are about 20’ from the singer, facing away from the singer to avoid feedback.

Any advice would be appreciated. How can I change my setup to allow the singer to hear themselves without causing mic feedback.