There must be good reasons why Litecoin has stayed in the top ten coins list for a long time. It is a well established project with a nice dev team and big community so will follow bitcoin up in coming years.
Litecoin often relies on the rise of Bitcoin so it is too early to predict the value of this coin. I think LTC can only reach $300 by 2020 if the market begins to recover but this is just my personal prediction and it depends a lot on the upcoming market. However, in recent days, the market has become more stable, so it is expected that LTC will increase in the near future.