First thing you have to realize about cryptocurrency markets is that the price action is mainly driven by news and release dates. Siacoin's dev team has been relatively quiet lately as they continue to expand and improve their project (slowly). They have said themselves that they don't want to hype their coin and ruin their reputation before their product is even ready to go mainstream.
Where are some of the best places to get news on different coins?
Any coin I find interest in I follow on twitter and also favorite on Tradingview. The Steemit community also has good posts, but where would you catch important news almost as soon as it is reported?