What it means
に慣れる means “to get used to” or “to become accustomed to” something. It describes the process of gradually becoming familiar and comfortable with a person, place, activity, environment, or situation. The thing someone becomes accustomed to is marked by に. The verb is intransitive, so it does not take the thing being learned as a direct object with を.
Usage note
に慣れる focuses on the process of becoming accustomed to something. に慣れている describes the resulting state of already being accustomed to it. Do not confuse this pattern with 慣らす, which means “to accustom” or “to get someone or something used to” something.
How to use it
私は新しい職場に慣れます。
I will get used to the new workplace.
私は新しい環境で働くことに慣れます。
I will get used to working in the new environment.
私は新しい職場に慣れる。
I will get used to the new workplace.
私は新しい環境で働くことに慣れる。
I will get used to working in the new environment.