So I picked up the last three bubble prices and see that in the first bubble, bitcoin price went up around 3000%, from 1 to 30 USD.
The second bubble, the price got at 200 from 10, so it was around 2000%.
The last bubble the price went to 1000 from 100, around 1000%.
I think the next bubble will be at 600% - 750%, I picked up the prices from the last bubble and multiplied by this percentage just to see how it will be.
So here it is. Have fun!
That's an interesting 'forecast' or rather speculation you've done there. I know it's merely the previous price adapted to the new level we are at now, but it will be interesting to see how this prediction will hold up after a year or two!