Personally I concentrate on the shorter term of a cycle or so.
I have seen many long term EW patterns covering the last century and of course only time will tell which one is correct!
Personally I follow the work of Bob Prechter at EWI who is convinced that this coming bear market will be very severe.
If correct his theory is that wave III circle of Grand Supercycle finished in Oct 18 and the coming wave IV circle correction
will take the indexes down towards the values in the 1970/80 period in the next few years. Scary thoughts.