I think cardano is good for you to recommend, because ADA is one of the fastest growing altcoins right now, moreover this project has launched their own smart contract, so the chance to get a profit is very high later, if you believe then now the right time to start investing with cardano before the price goes higher.
it's true that cardano is developing at the moment, but I think it's too risky to buy now because the price is increasing, it's better to wait when the price drops to $1, but I have another reference for you to invest in, namely POLKADOT, DOT is one of the altcoins which has high popularity, so it is very good for long-term investment,