になりがち

tend to become

→ に
phrase Rare #38,357
tend to become Expresses a tendency to become or end up in a certain state, often with a somewhat negative or undesirable implication. It follows nouns or な-adjectives, and can also follow the stem of い-adjectives or verbs in some contexts.
JA: 忙しい人は、食事が不規則になりがちだ。
EN: Busy people tend to have irregular eating habits.

共同責任は無責任になりがち

Collective responsibility often means no one takes responsibility.

大都会に住んでいる人は運動不足になりがち

People who live in big cities tend not to get enough exercise.

お前早口になりがちだぞ

You tend to talk too fast.

病人は悲観的になりがち

Sick people tend to become pessimistic.