Just a random idea: perhaps we should extend democracy to the spreading of information. I.e. you can spread information but only if the majority of people agree with it. (A post is evaluated/moderated by a small group, then a bigger group, etc., until perhaps it reaches the entire population). Moderation is not limited to groups, so echo chambers would not have a chance. EDIT: minorities still have a chance in two wa…
I think we need to clear this misconception that democracy is good. It may be the least evil form of managing societies we attempted until now, but it's in no way good. Democracy is violently (under threat or by direct action) imposing the will of majority on a minority.
Ironically, it leads to the exact opposite, where certain minorities express disproportionate power. For example, the rules always favor the status quo, so a minority in power can retain power, and subvert even largish majorities from passing rules they favor.
Democracy may well be the least worst form of government, but it's even worse than I think most people give it credit for. The assumption is that at least half the people are happy with at least half of the results, and it doesn't even guarantee that much.