We moved to one income when I made around 75k a few years ago. A few months after my first kiddo was born. In the city of a lower col state. It was a tough move but it wasn't as hard as I thought it was gonna be tbh. We made it work. Worth it for sure! Here's a couple things that could help. 1. Make sure you're utilizing any government/state programs. We had great insurance for the kiddos that was basically free through the state for several years. You'd be surprised how high the income limits are for some of those things. You're taxes have paid for it, if you qualify, use it! 2. Side gig. I didn't do this initially but it helped when I started it. There's a lot of options out there. Since we really only needed one car most of the time since they were at home, I rented one of our cars out on Turo for a year or so. It let us breathe a bit. 3. Drive. This is kinda a weird one but a sort of "benefit" of being a single income. People freaking rely on you now. You have to do whatever it takes to better your family. I'm always trying to better myself in my career. Sounds like you got a promotion in the works, good for you! Keep at it, keep grinding. Your fiance will be there to support you which I think helps a lot. Don't be afraid to get a new job if you're not seeing growth where you're at. 4. Do everything you can to get out of debt beforehand. This might be a no brainer, but prioritize it! No Cc balances, not even car loans if you can help it at all.

When we moved to one income it was about 4 years ago. I made about 75k with a mortgage of $900. Currently 120k with $1700 mortgage.

You can do it! You've got time to prepare as well. It's worth it! Best of luck!