Hello,
Guys i have 44 Bitcoins in online wallet blockchain.
am feeling very regret now why i did not cashout funds when it hit to 10k$
Seriously? That's huge

but i think you shouldn't mention the amount of bitcoin here. But please be careful about private key.
Yes, because some might send him anything like suspicious links or anything to get his wallet, but he seems not worried at all mentioning the amount of bitcoin inside of wallet because as he said, he is working in a security team.
now its 8.5k$ , i was expecting it will hit to 13k$ or 15k$ soon and then will cashout..
but now very few hours left for halving,
so what do you think? its will again hit the 10k$ or up to 10k$?
my target to make $1M but i`m losing hope as it already very down now to 8.5k$.
sorry for my bad english.
Thanks and happy earning guys

Due to Corona'r effect, people start selling bitcoin and altcoin. Maybe that's the reason behind dumping. But bitcoin halving is occurred. So can be expect pumping.
It's possible, or there are other more reasons behind this sudden dump.
But all in all, OP should not regret for not selling his btc, the bull run is yet to come, and it is better to put his btc to safety like in hardware wallet. It is much better than thinking of his regrets.