Override a lot of participants, but the finance has run it out, I couldn't refill money!

I got so many submissions, far more than my setting number, and I just focus on accepting them, didn’t notice that my finance has run out. Now the finance that button turns grey, even I want to increase my number, and accept more participants, it doesn’t let me to do it.

there still have many submissions are waiting for reviewing. I contacted them one by one, someone insisted don’t return their studies.

anyone knows what can I do to fix this??? It’s emergency!!!