Definition
Hang on in there : Said to somebody to encourage them to keep going & not give up.
Hang on in there(あきらめないで頑張れ): あきらめないで頑張れという励ましの言葉とらえて感謝しよう。
Example
I know this isn’t your ideal job role, but I think you should hang on in there and see if it improves in the next few months.
理想の仕事じゃないのはわかるけど、続けて頑張って、数か月後に良くなるかみてみたらどうかな。