EDIT : I am using pipepipe which is a really good client for youtube without ads and bullshit but with added features like downloading anything, better search etc . Adding this because a comment told me the downvotes were because it feels like i'm seeking ads .
I used to have a good enough list so that not much got released without me knowing but i lost it . I have subscribed to some i remember (attached image incase someone has use for it ) but i'm sure i'm missing a lot so do recommend .I like watching trailers in my freetime and if it clicks puts into my watch later list and watch it when i get time . I also have a24 and 20th century studios which didn't got on this list .
PS : I don't care about the nationality of the movie or tv shows that the channel releases trailers of but i'm looking for shows/movies in english or atleast a dub .
Edit : Why the downvote ? Wrong sub ?
If you don’t care that they are reuploading content, you can follow channels that specifically upload trailers. I don’t have a suggestion at the top of my head but I’m pretty sure there are channels out there that do that. Maybe search for channels that have “trailers” in their name.