Bitcoin market cycle is about 4 years but the map shows us an interesting fact, if hodlers can hold their bitcoins more than 5 years, they surely get profit so far.
There is no guarantee to get a profit, even if the chart shows historically what the profit levels have been.
Definitely no guarantee of profit especially if you didn't hodl or buy any bitcoin before the price of bitcoin reached an all time high besides not investing though I don't see how it doesn't guarantee a bitcoin hodler any profit when the chart is consistent that at this X period is the time where the price likely to hit it's all time high or something.
On the other hand, if you buy and the BTC price mostly just goes up from the point of your purchase, then maybe you just sit on your investment for as long as you believe is necessary until you cash out.. in the event that you don't create some longer term BTC portfolio plans that might involve cashing out incrementally rather than concluding that you are justified to cash out a bunch at one time, even if you conclude it to be sufficiently profitable for your own likings.
If you don't include buying back after cashing out then hodling until the desired price shows is going to be the most sufficient of them all and if you don't sell at an increment then wouldn't it mean that you're getting more profit compared to someone that's profiting albeit in small amounts because they sell a small part?