In longterm I think IOTA price can grow up to 500$.
really? what makes you think it'll reach $500. Have you looked at total number of coins? I think $10 is more likely, if it reaches $50 I'll be very surprised and happy. I had speculated that it would reach $5 between December and January and looks like I was right with that prediction
You made a good prediction indeed, and I think won't hit 500$ any time in the next year, but looking at how its price has been increasing from near 0.3$ to 6$ I'd bet for ya it's going to be 10$ soon, they have a great community behind.