"Get in with" is a common phrasal verb that refers to establishing a friendly or beneficial relationship with someone or a group of people. There are many synonyms for this phrase that can be utilized in various contexts. For instance, "befriend," "network with," "gain access to," "forge a connection with," "build rapport with," and "cultivate a relationship with" are some possible alternatives. Other suitable options include "establish ties with," "ingratiate oneself with," "get to know," and "make contacts with." Choosing the right synonym depends on the specific situation and the tone of communication. Nonetheless, the key idea is to describe forming a positive relationship with people that can lead to mutual benefits.