I think the "smart" time to start selling would have been this past spring during the supply shortage and glut of demand, but that time has passed. I almost sold my MTB, but I like it, so I kept it, and I don't regret it. If you didn't get into this for the business, don't start now...
That being said, it sounds like your situation is that you expect to sell due to some life changes, and I would think the same general rules apply -- sell in the spring/summer, post clean pics, be willing to negotiate if you want to move stuff.