Hi

I think if you have glued it like that then yes rebrake it and start again.

Not sure how the brake is but it prob won't glue very well a second time, might be better to cut twice at an angle and put a new piece in similar to depicted.

To strengthen cut a slot in the middle and insert t a thin piece of ply say 1/16 (not light ply) on edge across the middel of the whole join