Do you not talk about, say how you are going to navigate things as your children grow? Take the tv show Adolescence, or the misogyny that is infiltrating children's society?
I saw a video, when it first blew up in popularity, of an 8 year old(?) throwing a game controller at a huge tv because of something in Fortnite. That prompted a discussion that went off on tangents about the psychology of gaming and parental responsibility.
I've been a SAH for 17 years, more or less, well no salary job, and we never run out of stuff to talk about. It was less when the children were under 3, but it accelerated quickly.
I met similar minded, and not so similar in some cases, mums at baby groups and we went to each others houses and talked as adults. There were small scandals at the school gates, which are fun if you aren't part of them, actually sometimes if you are.
You could take your children out for photoshoots, not to put online but just for personal record. Get creative with the children in front of you. Or pretend to build a business together, or paint masterpieces.
I does get more interesting once the children can read, create, want you to cook different foods, have ideas themselves.
But anything you are doing, investigate, or research. For instance if you decide to plant some things in the garden with them, why not look into building a bee friendly patch, researching the importance of bees and trying to help give them a patch of the garden is, well quite interesting and quite important. That sort of thing.
I attempted to read a couple of baby rearing books I guess you could call them, I completely opposed the Gina Ford method but also thought the gentle baby led philosophy was too far the other way. My critique on what I discovered was always up for discussion.
So until now we've never run out of things to say, obviously there are lull patches but there are if you go to work as well. When H goes into the office, as he drives from here to there, and the office is hybrid, and he can't go for a drink afterwards, actually no one does really, he hasn't got anything to say when he goes into work, or very rare he has more to say when he works from home.