The market is still young, it still has a long time to go up. Today we are not yet at $ 200B while in Forex every day we trade thousands of B $ ... when the marketcap will reach 5000B $ then maybe it's time to go out.
For your question, what I understood in my first year of Cryptocoin is that:
1) If bitcoin is strong, all other currencies fall sharply in relation to the bitcoin exchange but rise in relation to the dollar
2) if bitcoin falls strong, all other currencies fall sharply and lose in relation to both bitcoin and dollar
3) when bitcoin oscillates with small variations, down or up, then good coins and projects see the light and can make astonishing performances ..... x5 - x10 - x30 - x100
Good coins that can give these performances, with favorable market conditions, are:
NEO - GAS - QTUM - LISK - IOTA - OMISEGO - STRATIS - WALTON - TAAS -ETP - SYS - RADIUM - KORECOIN - ELASTIC - PATIENTORY - IXLEDGER - SHIFT - XSPECTRONIC - Short then good coins to keep BITBOOST AND EIDOO
Good luck for your research!