If I go to a particular Sci-Hub mirror and it's down, I often go to the Wiki page to see the different TLD options. Same for checking some of my favorite Torrent trackers. I don't use Google for any controversial searches anymore, but if Wiki continues to degrade in quality, I'll really be SOL.

>If I go to a particular Sci-Hub mirror and it's down, I often go to the Wiki page to see the different TLD options

You can still Google Sci-Hub, and find plenty of pages listing active mirrors.

Notably, https://www.sci-hub.pub is the top hit for me, and is reliable enough.

The only thing that consistently works for me is the Telegram bot.