You have not elaborated your question clearly but I'll answer you according to my understanding.

If a token is falling then you have to see the background of the project and it's previous performances. I have seen project of thousands dollars worth on less than hundreds on bucks but the they again approached their ATH. So it all depends on the fundamentals and previous performances of the project. How legit a project is and how much people trust it this will help you to decide what to do with its token.