[tonymet]

Lots of good advice, so I'll attack it from a different angle.

In my experience step 0 is to acknowledge that these personality traits are not essential parts of your identity. We all go through periods where we are more or less introverted.

That doesn't mean change is easy, but it's an important foundation for making the change.

After that I would focus on practice above all else. I would seek out social activities ( hiking groups, maker groups, charity groups, etc) where you can casually be social. Try to take on leadership roles (e.g. organizing meetups, taking minutes, recruitment, etc).

There's tons of great advice, but much like learning a language, the best way to learn the "social language" is by doing.

Getting this experience out of the office first is a risk-free way to build your social strengths.

Really great topic thanks for bringing it up.