s&p500 predict it will move downward toward the last support

we see that s&p500 is downward .
But at the begining of the new year we are waiting it to reach the support shown in the graph.
if it reaches it . we can enter with a strong long position and wait for good results.
The most important is not entering at anyplace. Missing some point is more important that be in trouble with getting margined in this market.
we must keep stoploss as shown here