Simple avoid them. That could be the only solution. New projects are for them who have deep knowledge about them. Although that type of investor also get scam even after that much qualifications and knowledge.
The question is: how do you know that the project is a scam? Avoiding it is easy; what makes it difficult is what most people don't know: how to determine whether a project is indeed a scam. This is what we should teach people who don't know.
First you need to know how to find out a valid project. If you can teach yourself how to analyses about a project and verify it, then you can automatically avoid scam project. But it is not possible for every person to teach themselves and educate themselves about Cryptocurrency, so it is advisable for them not to investment new project, better to go with old top project. Scam project is really a big headache for cryptocurrency market even despite all the due diligence, People get scammed. So need to be very careful
Most people go into buying new Altcoins due to the highest possibility of profit from the investment unlike top Altcoins whose profits are guaranteed within a longer time frame. New Altcoins are risky that is the reason we consider buying in little fractions and investing an amount of money we can be able to lose without affecting our cost of living.