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Siacoin seems to have these good and bad cycles on approximately 6 months. Last spike was in January so we will need to wait till late May or June I think.
June or July will probably see exponential growth for the whole crypto market, not only for Siacoin. Let's wait and see what will happen.
From you mouth to Crypto Gods ears

Its all a cycle, the whole cryptomarket grew to fast in the last months and then the newcomers started selling at every FUD&FOMO and crashed the price