Yes it is the right time to invest on altcoins because its on the lowest price as of this year and you may want to consider the top 10 or top 20 in coinmarketcap which is accurate way to invest at you will never get wrong with that and if you want to look closely pic the top 5 and see there fundamentals.
If you expect the price of altcoin to increase in the future then it would be a great advice. Not sure whether we will see that rise and hence the risk is much bigger if you are investing in the altcoin market, bitcoin is the only coin that can guarantee that the price would increase in the future and if you are able to invest at the right time then you will end up in a profit. The top coins in the market might see some recovery but majority of the coins are dead by now and most of the projects shut their door and hence the risk is higher.