I'm a little older than you, without kids, and its still a challenge to work on my projects and other things in life (relationships, fitness, etc).

I've seen a friend of mine get up earlier to do side project work while then attending to their child, and perhaps this is a conversation to have with your partner, so you can support each other (carve out some side project time) to continue with that goal too, your partner may also be wanting a bit of time for themselves as well.