Kaifuku Jutsushi no Yarinaoshi

Kaere, due to his status as a healer magician, could not fight alone and was constantly exploited by others. But one day he noticed what lay beyond healing magic and became convinced that a healer magician was the strongest class. However, by the time he realized this potential, he had been deprived of everything. Thus he used healing magic on the world itself in order to go back 4 years, deciding to redo everything.