i think it depends upon your strategy that what is your opinion that is the price going to decrease or increase?, but as we can see now bitcoin is  price decreasing due to bitcoin banned in china. Maybe this time is time to buy because now price is lower as compared to two months ago.in my opinion this is the best time to buy more bitcoin.because this year is the best time for crypto to go high. much better to earn a bitcoin using the different campaign. But make sure that your earned bitcoin gives a benefits like converting to fiat some of earned bitcoin because incase that bitcoin will crash due to fork eoncounter, you have sure money.