As of this week, the Bitcoin Dominance (BTC.D) has broken out of a 6-month consolidation period. This means that money is flowing out of altcoins into Bitcoin again.
It's difficult to predict how high BTC.D will go, but I think we can make a an educated guess by looking at the diagonal purple resistance.
Historically, bull-markets (especially for alts) started at the red arrows. Remains to be seen if it will happen again.
For now, alts are likely going to lose value against Bitcoin, especially during dumps like yesterday. Start looking to buy alts again after BTC.D hits the top resistance.