For me if I have 60 BTC I will spend half to trade and keep BTC for myself 30 BTC, I will split into 2 to buy good Altcoin and the rest will open a small trading shop to I earn my daily income and I don't have to work for anyone else.
open a small trading shop ? as in a crypto exchange ? or others ? 30 btc is i think seem to be small on this kind of business but you said its only small right ? just put a limit or a warning for the maximum amount to depo or to withdrew so that your business can run as what it intended to be .
meanwhile 30 btc for your self is already a good amount to keep you goin in the future and who knows ? btc price could jump and you can earn alot of profit in the future if that happens .