Thanks for all of your answers, I feel closer to understanding the problem. Yet something still does not add up. Because I am the second largest coin holder (I actually have the coins in ONE single transaction to add more weight on the network) yet I still can't stake. I used to stake until about 10 days ago, then suddendly it stopped when the blockchain syncing stopped as I said previously.

My current getstakingstatus is

{
    "validtime" : true,
    "haveconnections" : true,
    "walletunlocked" : true,
    "mintablecoins" : true,
    "enoughcoins" : true,
    "mnsync" : false
}

Thanks again for your help!