Long Term Nasdaq Trend lines.

Here is a long term trend line chart of the Nasdaq going back all the way to the bull run leading up to the dotcom bust.
Each line has acted as incredible support and resistance during the duration of this current bull run.
Use these as places to consider taking profits or looking to start a new positions during this long term run and to manage risk accordingly.

After the top in 2000 the next bull market cycle did not start until the end of summer in 2009, and was validated in the winter of 16-17 with the break of previous all time highs.
A market in which we haven't exited since if you consider the higher highs and especially higher lows.
The trend line connecting the higher lows in Feb 16', Dec, 18', and March 20' could provide very strong support sometime down the road, perhaps years even.

With the current monetary policy the top is impossible to predict but it would seem the risk is to the upside.