Unwanted laser hair removal on hairline. Will this return to normal or should I explore treatments? (Photo)

Depends on how much trauma the hair follicles has had if you don't see growth in 6 months time then I would pursue medical treatment and there options from topical minoxdil, low light laser therapy, biopsy to see if you have perifollicular inflammation that require steroid injection series, and could try also neutraceutical as well

I would recommend trying out 2-5% topical minoxidil apply twice daily in the morning and before bedtime. In case the hair does not come back, a small session of hair transplant can fix the issue.