Bitcoin (BTC) failed to hold $20,000 into the September monthly close as one trader eyed a final comeback before fresh downside. BTC/USD 1-hour candle chart (Bitstamp). Source: TradingView Trader’s $20,500 upside target remains Data from Cointelegraph Markets Pro and TradingView showed BTC/USD staying lower after finishing the month at around $19,400. Capping 3% losses, the …