I have always found the CBC to be reliable as they will post corrections when they get their facts wrong.
I tried Ground News for awhile but found it just as easy to compare headlines between mainstream and independent news outlets to figure out the biases. Though I agree it is an excellent source.
This is what has stopped me from switching to Peertube.
Nebula is pretty good, though alot of it just doesn't interest me. I find it's more affordable and feel the handful of creators I follow there are worth the cost.
As much as I want to switch away from YouTube, it's my main source of entertainment and I don't see the creators I follow switching to any other platforms anytime soon.