As someone who subscribes to YouTube channels using RSS feeds, I found this incredibly useful.
https://www.youtube.com/feeds/videos.xml?playlist_id=UU<channel id>
Notice the UU and look below what you can replace it with.
UU - all public uploads (same as the channel_id= url)
UULF - all public videos
UUMO - all member videos
UULV - all live streams
UUSH - all shorts
UULP - popular videos
UUPV - popular live streams
UUPS - popular shorts
UUMV - member live streams
UUMS - member shorts