I have a few comments.

The first is that I want you to imagine your husband as a romantic lead. Are there any of those aspects that could be realistic? Do you feel comfortable discussing it with him?

The second is think about bringing some spontenaity into your life. Ask him to help you with dinner sometime. An unplanned trip to a cafe. When it snows jump right in and make snow angels together. Build a snowman. Veer off course to a gallery or museum some time.

How often do the two of you do things the other enjoys together?

So, have that chat, be spontaneous, share one another's interests. Those are what first come to mind.