Price to Earnings Levels for Credit Cards?

I've been reevaluating everything based on P/E ratios. Its possible to "trade" based on Price to Earnings Ratios.

Price to Earnings Levels for Credit Cards seems to be low?

For some reason I am even afraid that the P/E ratios are "too high" at 8 or 10?

The entire stock market SP 500 seems to be "slowing down" in the last few weeks? And its possible that some of the companies with "low P/E"'s maybe will not "recover" like all the rest of the larger companies?

From Discover Card Stock you see that the P/E ratios fell to about 4 or even 3 and then bounced back up to 5 and then seemingly are on their way back up to 10 or maybe even above. What is the best way to figure out P/E ratios? It seems to me that anything above 10 is VERY VERY too high...?

This is overall very different then my original guess that things would fall back down around late June of 2020? This data shows that things might fall starting in the start of June of 2020 and as early as next week?!

:(

It maybe that the "low" P/E ratios for credit card companies will help the rest of the industry?