I think you should sell your LTC and wait for the altcoin price to go down a bit far. Then use the money you sell your LTC to invest in ethereum. Because ethereum is much more profitable than LTC.
LTC is also profitable actually, it's just a little slower than Ethereum, and what you are suggesting is a very good thing because Ethereum is still the king of Altcoin to date, so it is obviously a very good choice.
If Litecoin is compared to ethereum I don't think it's fair,
because after all, as you say that until now, ethereum is still the king of altcoin,
the important thing is we have to have the right strategy for Litecoin,
because the coin is one of the potential coins and maybe in the future the coin can develop even further