Yeah I think the late 2017 rush created something of a 'bubble' that's now withdrawn and we're seeing organic growth again. LTC's quagmire is more related to its reliance on BTC's value, so as soon as the latter properly starts growing again, so will LTC. Its drop out of the most valuable coins is worrisome but I feel like it'll see a lot of investment with the plans the team have in 2018.
RE: Litecoin struggling- is it worthwhile to invest?