So we can not invest in the long term on minerium because people will continue to sell and make the price run out in the end?

I dont think so. I agree that lots of people do that strategy and try to make some quick money but not everyone. Once people understand that a coin has the potential to survive in the future, they will never sell those coins completely.
To OP: Slow and steady progress, will be keeping an eye on this. Looking forward to social media campaigns, already followed the official handle and promoting.