Every lesson so far has been about adding. This one is about stopping. Accumulating is a phase with an ending, not a habit you run forever. If you never stop, you keep pouring money in past the point where the plan is done, and a good build turns into an oversized bet.
The cleanest signal is your own plan. You set a total budget and a set of buy levels in advance. When you have deployed that budget, or price has moved above your highest planned buy, the accumulation is finished. There is nothing left to do but hold what you built. Chasing more here is just breaking your own plan.
The other signal is the chart itself. Accumulation belongs in the quiet base, the sideways range where selling has dried up. Once price breaks up out of that range and starts trending, the discount is gone. You are no longer buying a base, you are buying a rally. That is the moment to switch from building the position to holding it and thinking about where you take profit.
Stop accumulating when your planned budget is spent, when price rises above your highest buy level, or when the base breaks into an uptrend. Past that point your job is to hold, not to keep buying.
Tip. Adding to a winner as it runs is the opposite of accumulating, it raises your average and shrinks your cushion. If you feel the urge to keep buying a coin that has already left the base, that is usually fear of missing out, not a plan.