Honestly a pretty good signal for overall market strength would be ETH/BTC going up without the market nuking within 24 hours afterwards. Something which we've not seen since early November post elections. I think we've probably seen ETH/BTC rally/squeeze like 3-10% dozens of times the past year or so. The market selling off afterwards seems to be almost a certainty and its something everyone is aware of by now. So once that dynamic changes one day, be aware as it's small things like that which can indicate a change in the market.