Remember how long it took to convince ordinary people who were not dialed into politics there was something deeply wrong with Fox News in particular? Took like 15 years and there are still holdouts. (those in other media among the worst offenders)
We have the same issue with X. People think of media as neutral, social media more so. You say it's biased it's like if someone said "email is right wing!" ... what are you talking about?
I don't have a solution but this is the size of the problem.