First I will never recommend you to buy bitcoin fiat currency, but if you have good capital then you can buy certain amount of bitcoins and stake them  and get return on selling for higher price but its a ways to get fiat money. Which can be volatile.

I want suggest you a ways that can really generates bitcoins and earning more and more bitcoins itself increase their values.

Or I would like suggest go for anything that can generate bitcoins for you. Its little tricky process. But I am personally using it to generate some good amount of bitcoins to me, along with forum signature.