Make it wonky, IOW, it wasn't suppose to be perfectly matched, I meant it that way
Be a frog: rippit, rippit, rippit
Put it on the design wall and pin sew the seams in place
Add another spacer between the center and border and make the borders longer
Leave the small triangle overlapping the larger ones.
Be sure to leave 1/4"+ so the binding doesn't cut off the points
Throw it all out and start over (although I think what you have is great)
There's lots of "Happy Accident" options.