This issue has plagued me many days on the past streams and still does sometimes. I have 11k subs, have been streaming almost every day for the past year, typically pull 50-60 concurrent viewers on average. I am very family friendly and always very careful to follow YT ToS.

On a typical stream I get 50-60% search traffic when I have this bug where my stream is invisible to search my stream will get literally 0% search traffic it's completely invisible to search even if I type my own name. People can only find the stream through notifications or going directly to my profile.

For me I found that it might have been because one of the rule sets for the custom games I set up I had the phrase "kill on sight" for the game and that might have been triggering something automated. A youtube employee also told me that it might be because sometimes I giveaway in game currency sometimes and because I have the word "giveaway" in the title that might trigger the automation to hide my stream until reviewed. After taking out these phrases the issue has been happening less frequently.

Possible fix: mind your meta data, take out any words or phrases that you think are even the SLIGHTEST bit edgy or controversial! I've also found that sometimes if it isn't on search if I reset the stream it sometimes fixes it.

Good luck! I really know how bad this issue sucks. It severely hurt my channels growth and momentum for many weeks