If they said about returning you 100x something as you told, then you must be stay away from them. Reading whitepaper, their plan and roadmap, their community all those things Should be checked carefully before investment any amount. Although following such steps, still noboday can't guarantee that project was pure cause sometime project works good, gain lots of fame and them they run out with investors fund for unknown reason! So its complex and depends on luck i think
Study study and study again. First of all, I advise you to study scams, there is a whole thread on the forum for this.
All scams are in one way or another similar to each other, because these are scams and their task is to deceive you, at the same time your task is to identify similar criteria and, in the future, easily identify the obvious features of scam projects.
But for all this, you first need to study the enemy.