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Apart from the official resources in https://www.rust-lang.org/learn which are the bread and butter, here you have a list of rust books in https://github.com/sger/RustBooks
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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the second I mentioned is https://doc.rust-lang.org/book/ just to be clear. If you haven't read it already then I completely understand your frustration since Rust isn't a language where you can jump into unprepared and figure things out as you go like that... But it's a common exoerience that when you pass certain threshold you'll never want to program in another language ever again.
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Exercism - Scala Exercises
Crowd-sourced code mentorship. Practice having thoughtful conversations about code.
So I am doing the Rust exercises in exercism.io. My moderator insist that I used a functional solution to the problem that I already solved. I just couldn't find enough information to do so. That was the end of Rust for me.