I live in DC, and I can have access to key people. I am clear what is my goal for this next decade. I want to build and maintain a professional network in DC and in my original country. I don't want to just knock doors. I want to strategically know the people to reach, what is the WIFIIT for each network group, and how to maintain the network.
https://Meetup.com provides an easy starting point.
You can network.
Study what works + what fails at each event you attend.
Tool your own networking group on what works best.
I've been running Masterminds for years. Periodically I just pick a Meetup event near where I live or when I'm traveling + attend.
Highly instructive, so see how each group works.