Refactors

As Naval Ravikant said, 10000 iterations, not 10000 hours.

Making Games

There is a difference in the following: Making games because you like playing games. Making games to make money. Making games for a professional career. Making games for fun. In your career, understand your skin in the game and what game you are playing. Work accordingly.

DevOps

Doing DevOps will make you a better engineer. Period.

Infrastructure

Understand the basics and no matter how much I stress this, someone is still going to get an AWS Associate Architect certificate and be completely clueless about how to convert a computer into a server that securely hosts an API to serve/receive data.

Programming Applications

After all the effort in studying the pros and cons and viability of a solution, if you are still stuck on deciding between two techs, flip a coin. Decisiveness goes a long way. Ditto for life choices.

Managing Peers

Be willing to help others especially when they are blocked. Unblock others first. They will like you and be willing to return the favors. Be reliable, trustworthy, and avoid gossiping. Give direct and honest feedback when solicited.