Recently bitcoin and altcoins has risen rapidly, so i think this is not a good time to buy now, their price is so high now, you should wait until they drop then buy it, their price are very unstable so you should be patient before using your money in bitcoin or altcoins.
Yes it's to buy again because at the moment all coin down without bitcoin. So at the moment if you buy more coin, I hope you will earn a good profit in future