As long as Costco doesn't fall below 447.9 it looks like it is in a big wave 4 of Supercycle degree. A Supercycle that started in October 1987.
This wave 4 is developing as a triangle.
Wave e of that triangle should reach approxemately 465 - 468 Dollar.
From there a reverse fibonacci would indicate a target for wave 5 at about 1100 USD.
This is all in log scale.