The website https://www.twitch.tv/moderator/ is useful, but it is limited to 100 channels and randomly. I can see 100 channels there, ok, but several other channels like that are not there. For example, now three partner channels are online and they don't appear there for me, some with partner and without are there at the same time. I don't know the requirements to go there, but there are channels that have been online for more than 2 hours and are not in the middle or at the top of the list. It doesn't appear anywhere.
The moderation tool in the moderator view on any live stream you have a role in is much more limited than the previous site which is also limited.
Before the API changes earlier this year, there were some third-party websites that showed all channels.
It is totally unfeasible to go through 2000 channels every day (following limit) to check which ones you still have a function on. Some are offline for a long time, it doesn't make sense to leave it on Twitch IRC services (like chatty , chatterino, etc) because after a certain point it keeps reconnecting all the time.