I do not think you should.Litecoin is very cheap right now.So you should not sell litecoins.Ethereum will cheaper.Litecoin will increase.My favorite neo and ltc.
Still better if you convert some of your LTC to ETH, its also cheap right now. Diversify your portfolio into good coins so you can have a higher chance of making profit. The market is dump today, better to make a decision now before it pump again, the market will surely bounce and those great coin will also pump higher.