I don’t think you are totally out for this year unless you want to be.
Options as I see them:
A – add schools that might overlook the score
B – wait until next year
C – get a better score immediately (ways to do this: take SSAT flex test – check their website; you can take one flex test a year, and dates are flexible, take the February 8th test and call schools and let them know SSAT is coming – many will allow that, or take the ISEE – lots more dates available there)
Even if you are going for option A, I might consider taking another test in the next week or two (or at latest that Feb 8th SSAT).
If you were my child, I would do A and C. (Did you find some less selective schools to add to your list a few week ago? If not, then do it today maybe.)
I know that your disappointment may take away the joy of the project right now, but if I may encourage you not to indulge in it (not that you were necessarily; I just know I would) and rally into action instead since time is of the essence. Lots of schools have Feb 1 deadlines and even many who have January 15 deadlines, as long as your app is mostly in, they will be forgiving on the straggling item or two.