You can learn to be more physically expressive with the kids (if you're not already). More hugs/kisses/etc. It will be good for them and you, and H will notice (but don't put on a show for him of course)
You can work on your body language and adopt more "open" than "closed" postures. You can smile more. You can seem relaxed, and surround yourself with things that relax you. If you fixate on your phone as many of us do, you can stop doing that with kids and H present. These are not criticisms aimed at you, more just general suggestions in response to your question -- take what fits.
You can also read "How to Improve Your Marriage Without Talking About It" if you haven't already, which will give you some additional ideas.
Finally, you can change up your look (different haircut, maybe dress differently, etc.) I'm not suggesting dressing provocatively, just differently -- he will tend to notice you if you change your appearance and any unanticipated change in you is a good thing because if he didn't expect it, he'll question the other things he's assuming about what you will and won't change.
Accuray
Married 18, Together 20, Now Divorced M: 48, W: 50, D: 18, S: 16, D: 12 Bomb Dropped (EA, D): 7/13/11 Start Reconcile: 8/15/11 Bomb Dropped (EA, D): 5/1/2014 (Divorced) In a New Relationship: 3/2015