I have a single 7' x 16' sectional garage door (steel).

problem:

There's a crack at the top-most hinge/lip at the backside (the side
facing the inside of the garage) of the bottom-most section of the
garage door. That's what causing the sag (I suspect someone back
into it with the car a while back)

The bottom-most section is sagging (it bows) when the door is raised
to its top-most position.

For those handyman out there, are there any solutions that I can
attach to the lip/hinge of the bottom-most section that will
strengthen it so it doesn't bow when the door is raised?

There's always the replace the door option/replace the bottom most
section, but if there's a cheaper option ...