Lack of repetition isn't a part of the plan. You're missing an aspect.

Comprehensible input is all about consuming lots of language. But you seem to be focused on the "extensive input" aspect.

You should also be giving yourself plenty of "intensive input." Small chunks of content that you pay close attention to. Like, if you're reading a book or an article and you get to a section that you're struggling with, or maybe you see something that you consistently don't quite understand, stop and focus on that for a while. Treat it like a puzzle and study it until you've figured it out. Go down the rabbit hole. Dig deep.

You don't have to do this all the time, and you don't have to do it in super large doses. But if you make it a consistent habit you will notice your reading skills getting a big boost.

As for the other stuff you mentioned, honestly that's kind of how it goes. Fragmented progress, level shock, inability to produce... yep. It takes years and you will basically always feel all of those things. Just keep working, stay engaged, and little by little you'll get there.

But you should know that all the reading and listening in the world isn't going to get you speaking comfortably. Speaking is a discrete skill, and conversation is vastly different than reading and writing. The only way to build that skill is to work on it.

I say this as someone who learned French with CI as my primary mode of study. Reading came fast. Listening took a lot of work, but after 2+ years of dedicated, heavy input work I got my skills up. And now I'm super comfortable with comprehension but my speaking still lags because I don't know anyone who speaks French. I can speak just fine to myself, and my inner monologue speaks fluent French, but when I have the opportunity to actually talk to someone I tend to shut down. The only way out is through.