I want involve this sector fulltime. But is their any ensurity of better future?
I suggest that you should first try a bit of investment and trading without leaving your full-time job (if any).Then you should go through the full cycle starting from the purchase of the coin and ending with some profit in your wallet.
Otherwise you can just lose your money and become one of a crowd of crypto haters
if it does have real jobs, it's better to invest only in the long run and find potentially good coins for future price increases. so there's no need to leave the existing job, because if you make short-term investments it will take a lot of time to always monitor the price movements of the coin invested. the important thing before investing should be to understand first all about crypto.