Camera Help- Sony A7 iv or Canon R6 mark ii

I'm familiar with both Canon and Sony. I have the Sony RX100VII and the Canon 80D. I need to upgrade my camera (the 80D) but I am moving towards concert photography so I need to consider that when buying, I will also be doing business photography (headshots, branding, etc.) and create videos as well.

What's my best bet? (yes I have a few Canon lenses- 50mm and a 70-300- but they were the cheapest of the cheap I could get, they don't perform well in low light)

Thanks!