Copper, Monthly 40 plus years of history

I built this chart several years ago, I think at the close of year 2015.
So far the chart shows a 7 year time frame, bottom to bottom, then 8 years, then 7, and finally another 7.
It looks like we have another top in place.
Will a bottom happen again at a 7 year time frame, bottom to bottom, or maybe at 8 years this time, or something else?
If it is going to happen it is squeezed for time and likely to be in a hurry, as in 2008.

Notice the RSI at 30 for each of the last 4 times copper found a bottom.