Lack of depth problem

Can someone please give me suggestions on how I can improve the sound depth of my system? I recently upgraded my speakers to Focal JMLabs Alto Utopia, but they still lack of depth. They have wide and tall sound stage though.

The room is about 15' wide by 9' tall, and 23' long. The speakers are 5' from their rear wall and the seating area is 17' from that wall. The room is lightly treated with sound panels.

Thanks in advance.