Congrats on the new additions!
I would say that if you want to change things up, yeah the background, but something else that was more vertical would be cool visually. Like a large longer branch from the top down or bottom up. This would give visual interest, them a feeling of cover, but open up the substrate a little bit more. That's just my 2 cents but you know what my tank looks like.
For me I have shifted things in my tank over time. I make sure any caves are intentional and are in places at the sides of the tank so I can see them when they use them. I have also ripped plants out over time to try and find a balance of giving them what they like but me being able to see them at all times. Like there was this one area that the Del liked and it could literally hide every inch of her so I thinned it out a lot. It's harder with baby fish though.