Yes as soon as possible, this is the period that you must buy and see your money grow, but only invest the money you are ready to lose.

Actually, no body can say exactly which Altcoin you have to invest, everyone has their own research before investing in some Altcoins. But before making an investment, they keep following the rules in mind, such; Is the team efficient or not? Is the white paper clean? What product are they working on?.

I think those are things that investors think before investing.