If you're planning on holding the coins long term, then get them now; difficulty is increasing and supply is increasing. When talking about short term though, maybe wait for more price dips before purchasing.
Indeed, if you are goung to hold it for s long time then I guess this is the right time to buy since bitcoin is a little dump now there's a lot of folks are panicking to sell. We don't know when the bitcoin will fluctuate whether to increase or not but, we should act now and take the opportunity before it's too late, there are some speculation that bitcoin will pump within this year so its better to buy now. However, it is still depend on how we will deal this things.