Brush 19-20 points every day!

Excuse me, everyone, if I earn 15 points every day, and use 15 points for the airdrop plus another 15 points that expire after 15 days, that's a total of 30 points. Then if I replenish 15 points every day, does that mean that each time I receive an airdrop, I consume 15 points, plus the 15 points that expire after 15 days, which means I have to consume 30 points? If this continues, your total points will keep decreasing, and when the points don’t meet the standard, you won’t be able to keep up. Does this mean that a Binance account can only participate in one airdrop task?