Sometimes it's good for a reincarnated person to be OP. It can lead to unique plot developments and show their dominance in a new world. But too much power can also make the story less interesting if there's no real struggle.
You could focus on developing skills or powers that are not typically associated with healing. Maybe have a character specialize in combat or magic that isn't related to restoration.
You can try looking on popular manga reading websites like MangaDex or MangaFox. They often have a wide range of manga available, including Redo of Healer.
The main character of 'Mythical Realm' is definitely OP. They have unique powers and talents that give them a significant advantage throughout the manga. However, whether this makes the story more or less enjoyable depends on your personal preferences.
The appeal lies in the unexpectedness and the sense of wonder. Seeing someone heal instantly breaks the norm and adds a magical element. Also, it raises questions about the healer's origin and limits of their power, keeping us engaged.