Investing in them is risky due to volatility and fading hype.
Don't invest in something just because of hype, not unless you understand the risks.
Look at the positive side, both LTC and XMR have a strong community. That's what matters. There's no such thing as fading hype there.
Besides, the whole crypto industry in general is volatile from the beginning. Will you play instead on new tokens out there, which increase the risks and are more speculative, instead of keeping up with the momentum of those coins that have already been tested during the bull and bear run? Not wrong though, but up to you to decide.
Exactly and this is what should be done by investors. Also its good that OP ask this kind of question since he provably get some good opinions coming from people who has experience to deal with those coins.
But I think I will drop Monero in this option but that doesn't mean this is a bad coin but I just don't feel like investing on it.
For Litecoin yeah this is still good coin to invest but they need to have long patience and now that they are taking huge risk on investing on it since maybe they can see good result for adding this coin in their portfolio.