HODL or regret applies to projects that have a good team and the developments are progressive. Sometimes HODLing a fallen knife project will lead to regret, for example HODLing Bitconnect isn't a wise thing to do. It's better to cut your losses and move on.
Yeas, but there is always hope, I am currently holding tokens that dropped 30 times in price sins the last winter, and they are continuing to fall, and there is no any bad news about the project, or any scam accusations, they are just falling, I hope that they may be pumped someday by wills for example or the project will be finally recognized and noticed.