The Best way you can achieve automating the accounts is to :
1 - Create multiple instagram clones in mobile (one clone can have 5 accounts. 30 clones = 150 accounts)
2 - Automate accounts for liking your main account by macros recording type of apps (you need root access for that). Its easy to automate by simply recording your screen, even a kid can do that.
3 - ????
4 - Profit
imagine if you are using multiple phones like 10 mobile phones you can handle 1500 accounts, for handling 600 accounts you only need 4 phones
All of the cost here is those mobile phones, buy cheap refurbished phones here it costs 30 $ for one phone so 4 phones = 120 $ and you can get back your investment by reselling those phones after using them so.....