Are you still using RSS? If you are (and you should be, as we’ll see in a moment), then you should use the Feed Hawk app on your iPhone and iPad. Feed Hawk puts itself in your iOS Share Sheet and locates the RSS feed(s) from any website you visit. If you want, it can automatically subscribe you to the RSS feed in your RSS reader of choice.
The latest version of Feed Hawk can even find feeds for YouTube channels. That, in case you are wondering, is huge.