I suppose indeed best is to do nothing. I actually think crypto will rise again, it'll have nothing to do with real value of the coins itself, it was not in the past and I'll predict it'll not for the (nearer) future. But please keep an eye on bubbles.

You can do the math on eg Steem yourself very easily. Take FB users value (approx 225$/active users) or WhatsApp users value (appr 40$/active user when they were purchased), and compare that with Steemit users value.

On the distributed storage coins these type of calculations are also fairly easy: take the market cap, take their advertised pricing models and calculate how many paying users they need. Also compare their pricing with the existing Dropbox, Amazon, Box and other cloud services. Oh, also calculate the energy costs, especially in the distributed models.

When investing: take those real (non crypto based) values and use that as the baseline for valuation of the coins offering similar services, or at least to have to potential to offer similar service (eg Steemit, is by far not similar to FB, Steemit is just a little baby that still need to find its ways, and still requires a LOT of investments to even come close to what FB has to offer, not only in terms of features, but also in terms of revenue streams).

When trading, well, anything goes I suppose, but you need to have your eyes focused on the (super) short term trends.