All other coins and I mean ALL of them have been going up and down, Sia on the other hand has been mostly going down and down and furthermore down. Their is a reason it is going down and I am sure the people behind SIA is aware of it. I too got into SIA at a bad time and have 1M+ sia holding forever, 1$ and I will be a millionaire but never, I doubt SIA would touch even a 1B! Terrible investment choice!
Now is the time for making a decent investment in this coin. Most people buy overpumped coins and then complain for excessive losses.
Couple months ago price of 1M SC was over 8BTC and now it's only 0.6BTC. So, common sense would be to double your position and wait for next bull run.
Then, if everything turns out OK, you'll break even with your previous position and make XBTC with your new investment.
Dumbest decision would be to sell now those coins and take that huge loss.