1. Focus on shipping stuff

Shopping something mediocre is better than not shipping anything

2. Read (and understand) good code in many different languages

Learn concepts not frameworks

3. Understand compilers and their design

Understanding these fundamentials will improve your skills in many ways

4. learn how to read official docs

See tutorials and Videos as secondary source, official docs have mich higher information density

5. learn to use tools

Git, Ai, sonarcube and others are helpful tools... Learn about Them.

6. have private projects

Best case something you use yourself and you're passionate about