What to add to my engagement/wedding rings

[LMGH22]

Hello!
I'm currently debating changing the style of my engagement/wedding rings or adding a ring to them.
I currently have platinum round solitaire with tapered baguettes and a simple baguette band but feel as though something is missing. I'm not sure what it is or if I need another ring for a stack?

What are your thoughts? I'd also love to see some combos others have!

I thought I would like a stack, and chose and eternity ring that would match. But actually it turns out I prefer to wear the eternity on my right hand.

This is my stack, the bottom is a full eternity wedding band, the middle is a 7-stone eternity ring that I got after DS2 was born and top is my engagement diamond.
I like them because the setting is the same throughout (4 prong settling).
I think look for something with baguette settings to add as a stacker.