I have made a mistake back in 2013... bought some BTC when price pumped $500-$600 and sold it when it dumped to $250... and quit!
Come back in early 2017 (right on time), and I'm here to stay in crypto... As every day I see confirmations about the future of crypto and fall of the fiat money...
Accumulation period can be always, but NOW is ideal to do that as very soon the sell-off period will come... ;)