Good projects stay strong even when marketers dump. Already team should know there game plan in developing there project. If it's not having a good use case, it will not succeed. Some also depend on investors or shillers as they call them. But most importantly, a successful project depends on the dev and team.
The problems in what people think what is strong! They only watch current price, and they think that price represents true value.
That's wrong thinking, when Bitcoin price drops nothing stops, people continue to do the same, everything is alive and well, and
after some time the price rise again. With bad projects it's different, people don't use them in anytime, just pump and dump
group, they create volume for their needs, and when they dump everything, the coin drops and can never recover.