I always like "by example"s for learning languages - here's Rust's.
I'd probably make a project with it. Maybe a CLI tool using clap_derive and some crate that does something neat that you want to do. Depends what you're interested in I guess.
I wouldn't recommend trying to do leetcode problems with Rust because they are obsessed with linked lists and linked lists are awkward in Rust.
Also I wouldn't recommend making a game or GUI app with Rust yet since the ecosystems there are immature.
A microcontroller project using Embassy is probably a fun way to learn too but I haven't actually tried it yet.