1. Invest in stocks or mutual funds. Investing in stocks or mutual funds can provide you with a long-term return on your investment. The average annual return for the S&P 500 has been around 10%. If you invest $1000 into stocks or mutual funds, after 10 years you would have $2,593. 2. Start a business. Starting a business is a great way to turn a small investment into a large return. Depending on the type of business you start and the way you manage it, you could double your $1000 in just a few years. 3. Open a high-yield savings account. High-yield savings accounts usually offer higher interest rates than regular savings accounts. This means that if you deposit $1000 in a high-yield savings account and leave it there for 10 years, you may be able to double your money. 4. Invest in real estate. Investing in real estate can be a great way to double your money over time. If you purchase a property with a $1000 down payment and then rent it out, you may be able to generate enough rental income to cover your mortgage payments and still make a profit.