You should keep holding now until bitcoin reaches 8000$ for real. Sell it only a portion after 8000$ price has been achieved and hodl the rest. That way you would not have to fell regretful when price goes down and you also won't regret selling early when it goes up more. Anyhow, it would be wiser to diversify your money on many different cryptocurrencies for more profit here in crypto world. Bitcoin is not the only crypto with potential so learn how to pick good coins with potential before doing this.