Siacoin has been on a steady down trend for a long time; which means it could be time for a reversal as evident from the charts. Buying in now and riding up the wave of new buyers would be advisable, more of a long term coin. Watching for new news would be more beneficial to predict its future as a rising coin. There is no sell goal for "small coins" as the goal is to buy early and sell late.
A very interesting business model:
"Sia stores tiny pieces of your files on dozens of nodes across the globe. This eliminates any single point of failure and ensures highest possible uptime, on par with other cloud storage providers."
Makes for very cheap cloud storage!