I'm trying to find a way to duplicate my BTC before the halving without incurring in high risk...
If what you’re saying is simply to double your current bitcoin holdings then I would say it is the best and less risky option. It is true that Alticoins have tendency to grow in higher percentage than bitcoin during the bull run. But the risk is higher because most of these Alticoins could just dump anytime but with bitcoin one is guaranteed a cryptocurrency coin that is a store of value and also a ROI. Also almost every increase of the entire Alticoins depends on the percentage increase of the bitcoin.
If he really wants to buy some LTC, then, don't go all in. Only sell some to buy some LTC.
Anyone can say anything to create hype for the coin they own. Check if there's strong basis why he is saying such increase.
I understand that most people are looking for ways how to increase their holdings at a short period of time.
But weigh the risk you are getting into, sometimes it is better to just hold the coin that you are very sure of.
I think the OP is new to the game, if there is anything that will shortchange Bitcoin it's definitely not LTC, experience matters, and Litecoin should not outperform Bitcoin if history would repeat itself. I'm carefully studying the behaviour and psychology of many markets, and I don't even think that Litecoin would move up to 700%, but if it does, then Bitcoin can't move less than that unless it moved even better.
If the OP must invest in an alt at all, I think there are better alternatives that could still move about 1000% in about 9 months. Those might be such that has had significant fall from their ATH.