Every time will appear to be the perfect time for every accumulator, as they don't have to always look at Bitcoin bearish times before they can accumulate; rather, they set out an already working strategy that they can use and that will appear safe in every given market situation. They always have a set amount of capital to purchase more and add to their holdings, as what's most important is the amount they want to hold before a certain period of time and not the price they want to buy it at before that time reaches.
Just like you said, long-time holders don't have anything to worry about when it comes to price, as the price won't have any effect on time. Even if their portfolio happens to drop a little in total worth, it does not change the fact that they foresaw beyond the recent market price, but they are focused on what will come afterwards.
I think long term investment is the best investment to get good returns but the aim is never to start buying without thinking about the price. Of course, accumulating Bitcoin is a great strategy, but you should wait for the price of Bitcoin to drop from time to time. However, even if one has a large capital, he will try to buy at the lowest price and sell at the highest price so as to get more profit.
I think nobody's goal in accumulating Bitcoin is to accumulate more Bitcoin, but everyone's goal is to get maximum profit, and this is only possible when You get an opportunity to buy in a bearish market. One should never buy into the crypto currency market with full capital at once. Rather, one should try to buy Bitcoin at a lower price whenever the market falls. DCA is the best strategy to get good returns.