I see no problem with sales - it is natural sometimes.
I see problem with buys (they are too low...)

And I see 2 ways of additional efforts to solve this problem:
1. Short-term - good enough Promotion to attract new investors.
2. Long-term - good development. Development of trading infrastructure also. Now only few people are ready to risk and keep big funds on exchanges long-term. Hope one day we will see decentralized exchange (with no risk to lose money) - as result many investors could place long-term DASH buy walls.