To build a powerful network you can keep the following points in mind:
1. Set goal: You should set achievable goals. Meaning focus on the right people you want in your network and try to establish a long term relationship with them.
2. Etiquette is a key: To be able to build a network and establish a long term healthy relationship your approach towards the person should be genuine. Be a good listener to the other person.
3. Mindset change is required: When we talk about networking, it does not necessarily mean professional network. Somebody in your network can also be a very close friend or relative of yours.
4. Quality should be the focus: Increasing the number of people in your network is worthless if you don’t share a good and healthy relationship with them.
Here is an article which can help you even further to get answers to your question: https://www.feedough.com/build-powerful-network/