reach out

mainly US
to try to communicate with a person or a group of people, usually in order to help or involve them:
The new mayor is reaching out to inner city communities to involve them in his plans for the city.
We have to be more welcoming, and reach out more.

mainly US
to communicate with someone, especially by using a phone, sending them an email, etc.:
The Washington Post reached out to Turner for comment.
Feel free to reach out if you have any questions about study abroad.

to offer help and support to someone:
She set up her charity to reach out to the thousands of homeless on the streets.
It's been amazing to see how the community has reached out and helped.
(Cambridge Advanced Learner's Dictionary & Thesaurus からの reach out (to sb) の定義 © Cambridge University Press)

- Cambridge Dictionary