Write to enjoy, learn or hone a new craft. If you have personal enjoyment from that, then other matters come into play and whether you shoot for commercial success is an entirely different discussion. But at least give songwriting a try.

Many resources have been shared in these forums for how to approach this. But take the first step.

Whether you can be successful with a cello in a song commercially is a matter of opinion, and I seriously doubt there is anyone on this forum that can predict success or not if one chooses to include any particular instrument.

My Songs, photos, writing,etc.
My Sound Cloud