Rivian's (RIVN -2.53%) stock price has been volatile over the last 12 months, gyrating in price between $8 and $20. But make no mistake: Long term, this electric vehicle (EV) maker has huge growth potential. And next month could bring one of the most important announcements in company history.If you've been looking for growth stocks with high upside potential, Rivian could be the perfect fit for your portfolio. But there are a few things to know about before jumping in.Why Rivian stock is so cheapEvery thre ...