Just leave it in there and you will eventually have more money in there. Bitcoin goes up and down a lot but it does keep rising over time. I bought $10 worth of bitcoin through Coinbase in October of 2016 and have just let it sit there ever since. In 4 years that $10 has turned into close to $400. My only regret is that I didn't have $10,000 to invest in it back then.I stuck my money into this stupid Coinbase app that’s pretty much worthless to me now