am scared

I sold some parcel a while back when it was $3..and another parcel two wks ago.
The ride was quite exciting back then...full of adrenaline rush i must admit.
I still got a few parcel left...but now i honestly got quite scared. SIR market cap is nearing a billion dollar mark. No JORC proven resources, not producing anything, no income and yet it is valued bigger than the already established large nickel companies in ASX...i got burnt before in a bubble like this.

Can someone tell me when is the right time to sell please?