Develop Bitcoin? Trading? Do you mean you want to earn more Bitcoin?
If you want to earn more Bitcoin, offering services and joining signature campaign are my favorites. Avoid trading BTC or any altcoin if you don't have enough experience on trading, learn how to trade before try trading is a wise step.
yes that is, make the more BTC
Why should avoid? do not try to learn to be more reliable trader
and made 1 day profit of 10-30%
or trading or campaign here in the forum, last option is mining, altcoin, try to instamine them, if possible or try to search for one alt that is still profitable if you have free electricity or very cheap