Sure, it's all based on time. But 1 year and 10 years is a lot more fair than choosing a 1-month period.
The bottom in late July couldn't be precisely predicted, however there were signs things were going to turn around soon. It was just a matter of time. In the Blockchain world there is a lot more data available than for securities. People look at what are called "on-chain metrics" such as usage, who is buying and selling, the quantity of an asset increasing or decreasing in supply on exchanges, as well as various bits of news since that can have big impacts (April/May selloff for example).
So based on the metrics available, retracement levels, news (china negatively affecting sentiment and causing hesitancy, including from institutional investors and how that situation resolved itself, adoption news, project progress and launch schedules, etc) you can just start dollar cost averaging in when you perceive things to be a "good deal" relative to future projections. You aren't just sitting there with a big wad ready to drop. Well, some are. But since it's very hard to know an exact top or bottom, you just DCA in the region and you'll do ok even if it's not perfect.
You can bet that when ESG compliance is ironed out, much more institutional money will start coming in.
So, DCA in when things are down, DCA out when things run up quickly, and hold your long term convictions. It's really no different than equities, only the amount of data we have available for each differs. And don't expect to be perfect.