To find our trade here, we'd wait for the price to reach either of these two lines and wait on how the market will react if it reaches either of these levels. Though the horizontal support line is not as solid as the uptrend line, we might want to consider that as well in our trading. But it would be a lot better to buy at the uptrend support line after a price action occurs because this line is more probable to hold.
This index is going up, so it's up to us to analyze where to buy and that would be on the support lines. That simple.