I have had chance to deposit X in March 2015 and 3 months later I had 2*X.
I withdrawed X and kept X.
So, I have now nothing to loss and continue, withdrawing each week
no more than 0.8 BTC
Well, you have unrealised ("paper") profits that you could withdraw and either (a) keep safe, or (b) invest somewhere where you've not already been ripped off. I'm trying to understand why people would keep any BTC at scrypt.cc - I don't distinguish between money I originally had and (realised or unrealised) profits - it's all my money, and I want to protect it.
I take it your "X" is greater than the 20 BTC you "lost"? i.e. you've recovered (withdrawn) everything you've "invested" and the remaining "X" is just unrealised profit (that you hope to turn into real profit ASAP)?