If you plan on holding bitcoin in the long run, then they are now; Difficulty is on the increase, and supply is getting harder When talking about short term though, it may wait for more prices to drop before buying so we should often monitor bitcoin prices if we invest in making a big profit.
If you are aming of holding bitcoin on a long term period. Well you should get some now, because the value is getting lower so it is advisable to buy now if you are planning to make it a larger profit. Because if you don't you might lose the chance of earning more profit.