He mentions other things are more effective for leveling up (other things besides learning new languages). What are some of those things beyond "domain knowledg

He mentions other things are more effective for leveling up (other things besides learning new languages). What are some of those things beyond "domain knowledge"? Some things I can think of: databases, architecture, unix tools. What else do people recommend doing to become a better programmer? I'll admit I've fallen for the "learn esoteric languages" trap for a large part of my journey as a programmer.