Unfortunately, there's no way of knowing how much that you're going to make or lose from your buying of $20 worth of Bitcoin now when it's one month later or one year later. When the volatility of market is bullish after you bought and how high it went, may see $50, $60 to $100 or more in your spot wallet. When the volatility of market is bearish, you might wake up to $1 or nothing in your account.