Ignore coins with a 24 hour volume below 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.
It is more risky to trade low volume coins because it is more difficult to sell them quickly or buy them quickly due to less available trading partners, which can negatively impact the price.
DEFAULT_min_buy_volume = 500
OR
DEFAULT_min_buy_volume = TOP20
DEFAULT_DCA_min_buy_volume = 500