ADA is a good for long term investment, Cardano is a good project and they are officially registered, with a marketcap of more than $ 1.7 billion certainly makes me no doubt about Cardano's future.
As mentioned cardano is truly good for long term investing, Another important thing about cardano, it is affordable for all level of people as it is low priced. From my understanding even in the long term if it reaches the ath that's been reached earlier it'll be a big profiting for all the holders of cardano. Growth too is confirmed as there is continued update and development is going on without any interruptions.