At the moment, I suggest investing only in the popular coins like Ethereum, Ripple, Stellar Lumens, Litecoin, NEO etc since these are far safer investments when compared to investing into less popular coins or tokens due to the ongoing bear market. If you are still prepared to take a big risk, I suggest investing in Cardano, EOS, DeepOnion etc which seem to have great future potential in my opinion.
Investing in well established and popular coin is the best thing to do in current market. Although I wouldnt recommend investing in coins such as LTC and stellar lumens. Because if you know about crypto market, you would have already noticed that LTC is just a copy of bitcoin and operates on the same technology, moreover its litepay was a flop. And stellar lumen is a copy of XRP that is just on a more decentralized platform. But XRP has more partnerships and is continuously working on getting more decentralized.