If that's true I think the price of a Litecoin is going to rise again

The current price is about $4,34 (according
http://coinmarketcap.com/ ). It looks like it's only increasing as the Bitcoin is rising. So, I would say, let the Bitcoin rise

Completely opposite of the correct analysis you have there, as BitCoin rises LTC and other alt coins always decrease. When BTC decreases, then LTC and other alts increase. I think it's going to change in the future but that's the current trend right now.
In terms of USD, all cryptocurrencies have been rising steadily.