I don't think any time you entered before is good to buy altcoins because there is a total fall of it but instead i suggest you to invest you 100% money in bitcoin best in my opinion they are the most safe investment and the most profitable to. I personally invest in bitcoin and I am satisfied from my incomes. Bitcoin investment will also lea you to a good profit.

Bitcoins value is also greater than altcoins and most of the people trust it and think it good for there money investment rather than altcoins.