Here is a list of art galleries that have Calls for Entry for photography exhibitions. Now, I’m happy that you submit to Decagon Gallery, and I hope you continue to do so, but we all need to expand our horizons and reach beyond our comfort zones. So take a look at these galleries and see what they are calling for. If it fits your work, give it a try.
A Smith Gallery (one of my favorites)
PhotoPlace Gallery (another favorite)
That should keep you busy for a while!