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I can recommend the app ColdTurkey, if you use Mac or Windows. You can block sites permanently, in blocks or give yourself an allowance.

It’s a lot tougher than /etc/hosts: Disabling it during a locked block is very hard. That’s perfect for me.

I permanently blocked all news sites and gave me an allowance for HN.

There are also extensions that remove the recommended feed from Reddit, so you can still interact with pages found from search, but can’t discover new content once on Reddit. That greatly reduces my time spent there.