I buy bitcoin as my investment in future, using my extra cash to buy bitcoin with hope they will get me good return in near future

Haha, yeah that is every person who hold bitcoins , for its value to increase in the future. Like me, I also hold my bitcoins hoping that its value will increase and I will sell them right away. A lot of people got rich because of bitcoins. They bought bitcoins when its value was just 150 dollars and now since its value is 600 dollars and up their investment got a return of 4 times in just less than a year.
Some people were even luckier than that; I don't know if you saw the other threads that have been posted recently, but there were some people who bought their Bitcoin in the thousands for $27 and then proceeded to make $868k off of their investment. Those are the people who were REALLY lucky.
I'm also kind of trying to work towards holding for the future, but that's been kind of a challenge for me.
They are not lucky. They understand bitcoins value ahead of us. That is why they bought it and hold on it even when it was still almost no value. And they are now reaping the profits of it. It is not too late. Bitcoin can still grow more, and someday someone will say, they bought at 600 and now enjoying millions in profit.