Short altcoins, long bit-con?

This is a synthetic pair trade. This chart shows the performance of altcoins as a whole against bitcoin (in market cap).

Based on the December 2020 open horizontal, it appears alts have hit a resistance.

The trade setup: long bitcoin, short the alt you hate the most, for a 1:1 ratio. You can't short or long just one because you might be incredibly wrong (or right, but I'm not in the business of being right).