There are many ways to increase BTC. Firstly, investing. Invest is the best way to increase BTC. If any one have a lot of capital to invest, they can start their own business and earn BTC. Secondly, any one can grow bitcoin by the helping their logic. Thirdly, treading. Finally gambling and mining hardwares.
It's really easy to say that you should start your own business or invest in a business when you have the money. But in reality, it's actually not easy. At first you would want to research the things that are a thing in other places but that doesn't mean that it will click in your place as well. It's good to do research about your place and survey some locals what they want to see in their place or what their place is lacking. If you have a background on that field, then go for it. But not right away, you still continue to do a research. You don't want to invest at something and then ended up finding out that there's already a established business for that and the local that you interviewed just didn't know about it.