Agree pils, the high in 2015 was significant for a number of reasons. We may get a rally next year to test the high but it may peter out as a corrective move, that will be the tell.
On a side note the range in time for the GFC was 70 weeks. Take this from the 2015 high and it puts us in July this year which lines up with your weekly cycle. Another date to add to the cluster in the middle of this year.