Possible, if you bought ethereum 1 year ago with your 10k usd. Now you would have 600k USD. Very close to become a millioneire 
If you bought litecoin 1 year ago with 10k usd, you would already have 1 millione usd in your pocket
If you bought litecoin 1 year ago with 10k usd, you would already have 1 millione usd in your pocket
True, when you invested more during the time that the coin is at the lowest price and up to now you are holding it then you are a millionaire now.