Working is always the way to make money. And the people who know saves money is the key to have big money.
Saving money (especially fiat) will not make you rich. The net value of fiat money declines every year due to inflation, and if you are saving money as such, then you will be left with close to nothing after a few years. For getting rich, you need to invest smartly. Investing in equities, bullion, BTC, mutual funds, startups.etc can be good options.
Yeah, investing is the only way to keep up with annual inflation of fiat and eventually make you rich. But you cannot disregard saving as well. You need to have some savings to get started on investing or venturing into business. Plus, you need to keep some savings for emergency purposes or the rainy days.