avoiding token price dump is simple. Just don't invest on a token not supported by some named company or community. invest on a token that already has a working product or platform.
Even company with working product suffer price dump once BTC dump too. So its inevitable in crypto space since all tokens on exchange is volatile except for stable coins ofcourse. Even famous project such as ETH, XRP and EOS suffers major dump once there whale investors sold there holdings to get profit and invest on other project. The only thing you mist know to dodge token dump is learn TA and be updated on the news regarding the token you invest in.