You can invest at current price levels. I do not think that it will go down anymore and we may see a bull run soon.
We can't lift such happenings with bitcoin, we never control it and can't be predicted actually. Truly, we aren't have a stabilize market and yet we are struggling more on dips than of rising. But then, there is still hope for that and such trend will turn into good in the coming days. May you have more BTC today and make profit someday.