Request: Guidance from Staff+ Security Engineers

A request for any security engineers who are Lead/Staff/L6 level or above (e.g. Senior Staff, Principal, Sr. Principal, Architect, etc...). What advice would you give to senior engineers (and below) on things they should learn or prioritize for "leveling up" technically?

I understand a lot of what goes into promotions is not necessarily technical, i.e. politics, visibility, being on high-impact projects, etc... but strictly on the more technical plane, what skills, tools, trainings, frameworks, etc... would you recommend?

Thanks!!