By reinvesting it. Saving money and storing it in low-interest (close to nonexistent interest) rates just makes you lose out on inflation.

The primary target to invest in for me is stocks. The second would be funneling a large portion of my saved-up money into a lock-in investment (2-6 months) that has high-interest rates (10-20%). A relatively new investment for me is investing in eCommerce stores that I find on Feedly that have international clients (essentially international e-commerce stores). I've invested in 2 so far and it's going decent.