Guildeline for becoming a pro c++ developer

Hey everyone,
I’d really appreciate some guidance from experienced engineers, especially those working at strong tech or trading firms (like Optiver, Squarepoint, Da Vinci, Rubrik, etc.).

I’m currently trying to improve my C++ skills and would love to understand how seasoned engineers approached mastering it. If you’re comfortable sharing, what kind of roadmap or focus areas helped you grow into a strong C++ engineer and become competitive for such roles?

Any advice or perspective would be very helpful. Thank you!

https://redd.it/1pm9su3
@r_cpp