The cryptocurrency market has bounced back in a big way since May's lows. Bitcoin is back over $40,000, with many other cryptos following suit. While a run like this makes it very likely that cryptocurrencies will soon go to $100,000 or more, there are many that believe that it could end as soon as this week. For those who have an interest in buying Bitcoin, the 2021 year has brought on plenty of opportunities to make a killing.