I will tell you secret strategy - don't buy any "old" tokens that already been traded on exchange, you need only invest in ICO during crisis. The secret is that new tokens (ICO) is not dropping in crisis period, in most cases only old tokens affected by this. So best practice is to invest in new promising projects with whitelists and sell new tokens right after exchange listing.Don't waste money!
Although that new tokens or ICOs have plenty of potential for the future, there is no guarantee that the token will succeed or even become listed in an exchange in the future. Although it's a common mistake to buy coins which are already popular and has accumulated to a high price, it's safer to buy these coins once they drop especially for those who are just new in the cryptocurrency scene. It's going to be hard to choose worthwhile ICOs because there are so many available, and a number of them may be scams.