I think many coins will grow as the market slowly continues forwards, and the legacy coins (ZEC, LTC etc.) will slowly continue to grow.

But what interests me most is ICOs due to having the opportunity to be involved in a project from the very start and watch it grown from the ground up. BUT you of course have to choose wisely, ICOs are risky if you don't DYOR.

That said, the right ICOs can be the most satisfying to watch grow. Look for the next great projects which SOLVE REAL-WORLD PROBLEMS. Take NOIZ Chain as an example- we all (mostly) hate the current ad network systems due to them being spammy and the collection of our data is unwanted. But NOIZ is solving this by using blockchain and AI, by making users' engagement with ads not only more enjoyable but also a more satisfying experience by rewarding users with NOIZ tokens for their engagement. Brilliant!

If you can find a project which provides a genuine use case to solve a real-world problem it's very satisfying be be a part!