Both ZEC and ASTER had very fast high energy pumps.
After peaking, the price didn't immediately crash. Instead it went sideways and bounced for 3–4 weeks but that bounce failed to make a new high, and instead kept on forming a lower high.
From there, prices slowly bled lower for months.
This is a common behavior after hype driven moves. Massive pumps often mark long term tops, even if price chops around before the real downtrend begins.
There's usually some residual momentum after a top. When a coin absorbs that much attention and capital, inflows don't shut off instantly they fade over time.
In short: huge pump ➡️ distribution ➡️ weak bounce ➡️ long downtrend
A useful pattern to keep in mind. I am shorting ZEC after a brief pump. It's giving 100% results so far...