Wow thanks for all your help guys. looks like I have some responding to do!
As for my plan, I am taking out 30k, my intial investment was 10k in 2014, so I am 3x up no matter what happens now. I am going to buy a nice car and have a nice holiday this summer with my money.
I will diversify my portfolio with a few top 10 coins, IOTA and Cardano look good to me. I think Bitcoin and the Alts will ebb and flow a lot this year, so plan on moving most of my funds back into Bitcoin when I see a bullrun commence (I think this will be around mid 2018 when other big banks start offering investments into BTC) once the bullrun has ended, I will flip back into Altcoins and hopefully make a tidy return. I will keep you all posted on how it turns out for me

First of all I would like to congratulate you for your great achievement.
I hope you have taken the right decision to take out only 30k from 600k after evaluating all the aspects.
If you take out 500k and keep 100k for crypto investment, I think its enough for you to make another 1m within this year or by 2019.
My best wishes for you - keep it up. And this time spread your money into more coins for more safe investments..