Here's an idea. On your main computer, no stacker news, via a line in your hosts file (https://helpdeskgeek.com/how-to/block-websites-using-hosts-file/).

On another cheapo low-performance old laptop, allow stacker news.

Put the cheapo laptop somewhere inconvenient. Maybe take the battery out so it needs to be plugged in. Maybe have it somewhere, where you need to stand to use it.

Having to actually get up and go to a different laptop is a great way to limit the sites that are distracting you.