What will happen to this market within a year...? Investing on BTC was great on last few years. But if we invest on these days for a 1 year, will it gives a good profit or not?
It doesn't matter whether it is good or bad. The first question is whether you can afford to lose the money you have invested. Is $6,000 a bid deal for you? If it is, you might not have the stomach to live through the ups and downs. You might be tempted to cut your losses when your investment drops by 50%. You might not be able to hold for the long term.
How come that it doesn't matter whether it is good or bad profit? And what is bad profit, a loss? Anyway, if you invest only what you can afford to lose, you will not be satisfied with the profits. It doesn't mean that you should invest all your life savings, you shouldn't do that, but if you are not willing to risk, then it is not worth investing at all as your profits will be laughable. For example, if you were a multimillionaire, investing a few thousand dollars would be worth neither profits you could reap nor the time you would spend on making these investments.
Actually, it is not about how much you are willing to invest. It is more about the knowledge you possess about the asset you are going to put your money into. In other words, if you know nothing about this asset, you'd better not invest anything in it, whether you can afford to lose your investment or not.