It's not too late. Just resume the wound care protocol you began.
The reason for keeping the wound moist is to nourish and nurture the new tissue growth and to discourage bacteria.
The wound would heal eventually if allowed to scab over. However, and this is from personal experience caring for second and third degree burns on a good one fourth of my own body, as well as wound care on my chickens, new tissue grows in much, much more quickly if kept moist.
The reason for keeping the wound moist is to nourish and nurture the new tissue growth and to discourage bacteria.
The wound would heal eventually if allowed to scab over. However, and this is from personal experience caring for second and third degree burns on a good one fourth of my own body, as well as wound care on my chickens, new tissue grows in much, much more quickly if kept moist.