Well, the point is that if you want to make x10 in two years, with bitcoin I think it's unlikely you will. The normal scenario is that it will make x3 at most or in a total bullish scenario x4.
In any case, a x10 in two years is not realistic because it is a 500% annual return and that can only be achieved by betting (even if it is on financial assets).
Between two market cycles, we can get different ROIs with same exit, assumes the exit is ATH of a new cycle. Depends on the entry, like bottom of a bear market or ATH of a previous cycle, we will have two ROIs.
ROI for ATH of past cycle to ATH of this cycle will be certainly lower than ROI of bottom price to ATH of this cycle. It is hard to find bottom price and time the market to get its bottom, so dollar cost averaging will be most helpful.
Look at this chart.
Bitcoin price history, ATHs and bottoms.