Holders are not paid by balance. They are paid by steep weight, which is balance scaled by how long the wallet has held without selling.
t = now − lastSell(wallet) w = balance × (1 − e^(−t ÷ 21600)) share = w ÷ Σ w over all holders
Tau is six hours. A wallet that bought a moment ago has t near zero and a weight near zero. After six hours it has 63.2% of its full weight. After twelve hours, 86.5%. After eighteen, 95.0%. After a day, 98.2%. Any sell, of any size, sets lastSell to now and the weight starts again from zero for the entire remaining balance.
Buying more does not reset the clock. Only selling does. So the way to hold full weight is simple: do not sell. A holder who trims a position pays for it in every pour for the next day.