If no investors nothing will help. Even hard fork will not help.
Does your educated opinion say something else?
What investors? There are already too many HODLers on Obyte who doesn't spend, just sit on their bytes. Obyte doesn't need investors right now, it didn't even need an ICO.
Yes, it needs witnesses who will also stay, so you can't bribe them with fees. Witnesses are not investors.
Obyte also needs developers and businesses who build more stuff using Obyte as a platform.