On the best way to impose regulation to prevent digital sites from boosting the internet of political delusion.

I don't see any way that changing CDA section 230 could help achieve this goal.

As for the issue that 80 countries could regulate internet discussions in 80 different ways, I suggest that the solution is to make it easy for a web site not to do business in any given country, and then it would not have to follow that country's regulations. This should not involve refusing to let people in that country post comments, but they could not purchase any services from the site.