The best choice is to buy more bitcoins and hold it because I am sure that in that event it will reach the 4000$ market cap and the bitcoin is pretty popular now and for the segwit there is nothing to worry about in my opinion so just hold your coins and if possible buy more bitcoins.
Yes, you don't need to cash out, you will lost a opportunity once bitcoin price goes mad after Aug 1. You will regret it later for cashing it out. So hold on it and if you still have funds you can probably stash more and wait till the price reach $4000 in the next succeeding months. The future of bitcoin is really looking good because of the BIP91 locked in and the split may never happen after all. So don't worry and not be afraid for the future is really really bright.
