Selfish.
Had the kids. Is bored and wants to move on, and the oldest child is only 5.
OP’s partner is already working FT hours if she’s working normal 35/36 - 40 hours pw. That’s tough with young DC, and tougher if the other parent is not already pulling their weight with childcare and household responsibilities.
OP - How much are your current childcare costs?
Do you do 50/50 of childcare, nursery and school runs, DC’s bath and bedtimes, reading books with DC, homework, library and swimming pool visits, household shopping, cooking, cleaning, laundry, household maintenance, gardening, ferrying DC to activities/parties, etc, now?
And 50/50 re: all of the other things I haven’t mentioned that are involved once you decide to bring children into the World?
OP - answer the questions about why you think your partner should work less hours? Who will that benefit?
Will you benefit from her decreasing her hours in regard to her paid employment?
Why don’t you work less hours, thereby taking a hit on your earning power, so you can be more present for your children?