Creating a YouTube Channel | Need advice on what camera/gear to buy

I want to be able to produce a multitude of different styles of content for the channel eventually. But It’s most likely going to start with a pretty basic two person discussion style. So with that in mind, I have a Canon rebel t5i and about 5 lenses for it. I want to add another DSLR first and then a camcorder eventually (we’re planning on a fairly slow rollout for this content initially). Looking to stick with Canon for now for the sake of simplicity. So with a camera budget of about $1500 what I am mostly seeing as my options would be the 80/90D, the M6, or the RP. Looking for any insight/advice.