Ignore coins with a 24 hour volume above the specified amount. Volume is measured in units of your base currency.
If you are trading BTC, 500 = 500 BTC in 24 hour volume. If USDT, 500 = $500 (you may need to adjust this value according to volume of the market on your exchange.
DEFAULT_max_buy_volume = 500
OR
DEFAULT_max_buy_volume = LAST20
DEFAULT_DCA_max_buy_volume = 500
OR
DEFAULT_DCA_max_buy_volume = LAST10