I used to use the /r/television sidebar but it isn’t very comprehensive. More recently I’ve been using Wikipedia’s 2023 in American Television page, specifically the debuts page, which is good. Some other countries have their own pages, such as South Korea.
Know of any other good places?
I’ve had good luck with trakt.tv to find new things. I usually just sync up what I watched with it with the SeriesGuide app, but it does have very basic “popular” lists in that. The trakt site is good for various lists and searches and you can see lists made by other users. SeriesGuide also let’s me know when a new season of a show I’ve watched is coming out. The 2 pair week with each other. Trakt has it’s own app pretty recently, but I haven’t tried it.