I disagree with your statement, why can't invest in new projects, not all new projects are scams and also not sure old projects are safe. Luna is the old or new project and do you remember how it died? As long as you always do your own research before investing and are always willing to take risks, investing in new projects is good and has the opportunity to bring high returns.
DYOR is really the best thing to do when you're about to invest in old and new projects. That's how you do it and you're holding in your hands the guidance that shall put you at your safety.
But in terms of safety for its volatility, no one has that way of escaping it because all of them are volatile regardless of how old and new they are. And in the scam projects, at the earliest you'll find them out that they've got a different agenda and they're likely to scam.