While I still think Bitcoin is the gateway to cryptocurrency exchanges, is it too late to invest because the value peaked at $19,000 in 2017? I suppose the gap between January 5th and the 11th would be a good time to buy Bitcoin and hold it until the value rises again. Then, you can purchase a greater number of altcoins. Of course, this depends on changes in the currency exchange ratio between Bitcoin and the alt cryptos.
The trend is that when BTC goes down ALTs also tend to go down. So you wouldn't benefit greatly from this strategy. Altough it might be a good idea, because after the crash BTC always recovers.