Bitcoin is back above $80,000. According to CoinGecko data, BTC traded at around $81,000 on the evening of Friday, September 18, 2026, up a good 6 percent on the day and at its highest level since September 7. Many investors now face the same question: buy more, hold or take profits? The answer depends less on the daily price than on three points you can check yourself: your holding period, the way you buy, and where your coins are kept.