I have made more money on Litecoin than anything else in the world. It’s an awesome coin with many similarities to Bitcoin. If I had to pick only two coins to invest in, they’d be Bitcoin and Litecoin.
If the long term trend continues, there’s technically never a bad time or price to buy Bitcoin. I try to focus my efforts on dollar cost averaging into local bottoms, and selling in stages as the price rises. I never sell any position for less than 10% profit.