The most sensible time to invest is when investments are low, because then each coin you invest represents a larger share of the bankroll, and so gets a correspondingly larger part of any bettor action.
This is like saying "the most sensible time to buy Bitcoins is when the price is low", which sounds logical, but has something wrong with it.
You can only judge "low" by looking at past prices, not future prices. Only in hindsight can you tell where the "bottom" is.
You can't tell if tomorrow's price will be lower than today's, which would make it "un-sensible" to buy today.
Given that J-D has a +EV for the investor, you can expect every moment to be at least as sensible to invest than the next.
(Someone tell me if this is pretzel logic.)