We are all prone to biases established over hundreds of thousands of years of evolution. Even if you're aware of all of them and vigilant you're going to fall for them sometimes.
No source lacks bias, but you're not trying to find the least biased source. Instead use multiple sources where you can identify the general biases a source supports. Rotate multiple sources and reference the same stories and events from multiple agencies knowing which biases they generally push to get a better overall model of what is actually going on and why. Fox, Al Jazeera, RT, BBC, CNN, PBS, Reuters, France 24, AP, common dreams, democracy now, etc. include at least 1-2 geographically local sources.
My preferred method is rss feeds so I can aggregate many sources into one place. Also avoiding articles that are just person X says Y, focus on actions and events instead of people using journalism for PR like politicians and oligarchs.