Speaking as a working parent (married to another working parent), it's worth pointing out that this dichotomy isn't mutually exclusive:
raising children is far more self-fulfilling than working a job could ever be for most people.
I agree with this! But I also would note that of the 168 hours in a week, being away from them for 50 of them (especially if they're at school anyway for 30 of them) doesn't really detract from my ability to do both big picture parenting (teaching life skills, moral values, building memories, being a role model) or even the small stuff that adds up (cooking meals, helping with homework, listening to them, talking to them, taking them to and from extracurricular activities, pursuing hobbies together, etc.).
So it's not an all or nothing thing. Most working parents can still raise children in an immensely fulfilling way, so the fulfilling part of a stay at home parent isn't actually exclusive to the stay at home parents.
I agree with the others who say to get in the mode of making new friends through hobbies and other activities. Not every friend you meet will be dateable (a woman you find attractive who is available and attracted to you too), but the act of being social and making new connections does a few things specific to dating:
Plus, like, the actual benefits of friendships with other people, and having people to pursue your hobbies with, will just be great to have even without dating.
Some concrete examples of how I've made friends (I've moved cities a lot so I had to do this like 7 or 8 times in my adult life):
I'm still a social guy. I'm happily married, but I still make new friends through many of these avenues, plus through my kids and socializing with other parents at their activities. You do it enough and you learn what type of people you vibe with, and who you enjoy being around. With that baseline/foundation, it's much easier to engage with potentially available women, too.