Here reason are unlimited accordi to understanding and knowledge , but here I have many another reason that I can tell you perfectly that what you will get if you can invest today .
First of all the mining of the bitcoin become tough that will results into lack of supply of the bitcoin and that will results into profit .
Second thing is that demand of bitcoin increasing rapidly , so better to invest .
Third reason is the fork in the bitcoin Because every hard fork in the bitcoin is resulting in the new coin and we are getting free coins equal to the amount of the bitcoin we have in our Wallet , so why not we should have bitcoin in advance before the hardfork .
So if you want make money then you should invest in bitcoin today and enjoy the fork and increasing price in bitcoin .