Momentum comes from innovation. If you want to keep up the momentum then you have to think up ways to innovate in areas which would make Bitshares X:
1) More contagious.
2) More sticky.
Any ideas or innovations which can accomplish this will increase the market cap. Even if it's not a new idea, if it's something which isn't being done which you think should be done then figure out the cheapest most efficient possible way of doing it.