Making the node available and opening channels you will certainly get some traffic and routing.
But that alone is not enough for it to be sustainable / profitable.
Lightning at the base from a noderunner’s perspective is a liquidity marketplace. Buy low, put that liquidity where it is needed, and sell high. It’s a bit of an art and learning curve to do this effectively. And a constantly moving target as well, since liquidity, volume, etc on the network as a whole are constantly shifting.