It is impossible to be immune to filter bubble effects. The only way to be immune is to not filter at all (can't be in a filter bubble if you don't have a filter), but you can't do that. Even keeping up entirely with lil' ol' HN would tax you, and I don't know how many zeros to put in the 0.0000001% but HN is not very much of "the internet".

If you think you've got yourself into a situation where you're immune to the filter bubble, that just means you've created one so comfortable that you never get prodded by anything.