Crypto trading is getting more and more technical as the days goy, and the formula that worked back then in 2018 is no longer accurate at this moment
More technical? Did people not use a specific trading technique previously? I think there is nothing different with the previous trading but traders may use varied ways in trading. As far as I know, each trader won't use the same way or a fixed technique (strategy). So, it is normal if they have a new technique (strategy) since they must adapt to the current situation of crypto market.
By the way, what do you mean by "formula"? Do you mean strategy? Sure, the trading strategy will be always developing, it can be changed along with the change in crypto market. Also, a trader may try to use a different strategy if they think their current strategy is no longer effective.