I would sell it now, and if you think zcash is good, buy again in December.
You can check the future price for Zcash at bitmex(which is a good indicator of future trends):
https://www.bitmex.com/app/trade/ZECZ16

Zcash supply is bigger every day, because of the slow start. The block reward will reach the normal size around early December.
More info about zcash slow start:
https://z.cash/blog/slow-start-and-mining-ecosystem.html