Work. Buying a little at a time every week. Which I was doing that a few months ago.
You don't need to do it every week.
I mean you can time your purchase when the price of BTC is lower than the usual price. The price of BTC is so volatile that we don't really know what will happen in the near future. All we know is that it has a possibility of pumping and that is the thing that we are wanting to happen. We just buy on the dump and hold it until it pumps again, you don't need to worry there, holding and being patient in a long time is worth it.
As an interested bitcoin investor, it is not everyone that has the money to buy bitcoin at once when it bottoms, some are able to buy with the little money to buy then and be looking for opportunity to be topping their investment up.
I understand what you are advising, you are just looking for a situation where people will not fall into the trap of the peak investment again, but I am sure they must have all learnt their lesson now, and even if he is buying the little portion he can buy every week, he will still earn profit on each of them provided he does that before the Bull run, after all isnt it every day that traders even buy and sell?