I'm currently going through Rustlings, (github.com/rust-la...) (which is by the way a great experience to learn the language !) but I was wondering, what to do with this new knowledge ? What can I implement ?
Since even the Linux kernel is adding support for Rust, I'd say you can implement literally everything from device drivers to web-applications.
I mean I really like getting into some new tech but after I struggle to apply it to a new project...
You're not alone. II usually try to (re-)implement some small tools to get a grasp of the language. A log file analyser or system info tool maybe?