Yes, the best time may be now. Any coin may be a potential gain during times when bought at a lower price. Yet the prices of coins doesn't guarantee success and even the stable coins could just drop. So do investments with extra care and do more research about the coin to buy. Certainly you don't want to buy when others are still dumping slowly there coins.
but chose the coins wisely. don't just buy any shit coins/tokens.. specially ICO tokens. I would say never buy any ICO tokens. most of them are pump and dump and only waste of time and money.
and if you still want to try an ICO then you need a lot of research and due diligence. so I advise you to try a top and established coin.