I'm registered but only plan to buy about $700 of ZRX tokens. How can I make use of my unused cap?

I'm planning to buy about $700 of ZRX of the $1,736 day 1 cap. I'll be buying $0 in the day 2 (3x) and day 3 (7x) caps. I'm already registered.

Is there any way to sell or arbitrage my remaining unused cap?