Just some thoughts. Empower yourself to be your social director. For you and your family. The internet is full of local ideas, events, festivals, and things. On site and local mom's groups.
Next, your husband may be willing but doesn't know how to change. Behavioral therapists have the person try the different behavior until they get used to it and (hopefully) find that it improves many things. So, you list some good ideas of what he can actually do with his off time that you want him to try to do. that includes time with you and no kids (do you have a babysitter?) and time for you away from the kids with him managing the childcare while you're off with other moms, or meetings, or classes, or just getting your hair and nails done.
You didn't mention if his work schedule was that demanding or is he a workaholic? What part is his choice or not? Open, non emotional conversation with options proposed, get feedback, insist on his trying your ideas or coming up with his own to consider.
One additional question: If you both didn't mutually agree on having kids asap before you gave yourselves some couple time, he might be a bit unhappy with it and not prepared for that huge change. He might harbor some resentments about his not having a choice in the matter.
Also, ensure your kids aren't running your life. You give them quality time in some area you all enjoy (crafts, games, creative play) and you may need to insist on quiet play time from them whie you do something you like or need (sewing, reading, calling friends). Know yourself and your highest needs and then find a way to experience it often.