They pay themselves first

By setting aside a portion of their income every day, week or month—in other words, “paying yourself first”—self-made millionaires take one of the most important steps towards building wealth, according to Bach. “You’re going to work 90,000 hours over your lifetime; you should keep at least an hour a day of the income,” he says.
He recommends setting aside an hour’s worth of your income each day and then saving and investing it—preferably automatically to begin earning some passive income and reach that high-roller status.
They find a passive income source

Speaking of passive income, self-made millionaires save even more money by investing their savings in an account that creates passive income through accumulated interest, such as a high-yield savings or investment account. There are several types of accounts to consider, and ultimately, the one you choose will depend on your financial goals.
“No strategy is a one-size-fits-all approach, since everyone’s financial situation is unique and different,” Palmer says. She recommends speaking with a financial advisor to learn the right strategy for you and to avoid the most common retirement-planning mistakes.
They put away the credit card

Credit cards can sabotage even the best of savers, according to Corley. “Credit card use can easily get out of control,” he says. “If you rely on credit cards to pay for ordinary living expenses, that means you are living beyond your means.”
Not only are there high interest rates on credit card debt, but paying with plastic could also trick you into spending more money. In a study published in the journal Marketing Letters, MIT researchers found that shoppers spend up to 100% more when paying with a credit card—and were even willing to pay twice as much for an item as those who paid in cash.
The 100-day credit card money-saving challenge could help you break bad spending habits, according to Corley. Essentially, the goal is to go 100 days without using your credit cards for purchases. The result? “Having to use cash or your ATM card forces spending awareness and restricts how much you can spend,” Corley says.