expression, godan verb (-ru)
return to one's original intention; recall one's initial purpose
Used when someone goes back to the mindset or motivation they had when they started something, often after losing focus or becoming complacent.
仕事に慣れてきた今こそ、初心に返って頑張りたい。
Now that I've gotten used to the job, I want to return to my original intention and do my best.
When he hits a slump, he always tries to go back to his original purpose.