BTC is back ? is that good time to invest ? or still wait for few days ?
I would expect, because very often after such a sharp rise, there is often a fall, and this can be substantial
So I have to wait for sometime?
Yes you can wait for sometime but I think, the decision still falls from your own hands whether you will still wait or you can just exchange it already. The value of bitcoin is quite reasonable now to be exchanged but my advice is to just wait for it it to get higher than its value now.