Long term I think Litecoin's price can still appreciate significantly. It is already in the top 10, so potential gains are not as much as with coins with smaller market caps. I think it's a coin with lower risk, which also comes with lower potential rewards. I do not foresee it ever dropping out of the top 20, and if you think the total crypto marketcap will increase significantly over time as I do, then it's quite reasonable to have it in a diversified portfolio. But don't expect 100x gains with the current price.