You're probably not getting any replies because (as you know) you certainly don't HAVE to do anything -- you're basically on autopilot for early retirement at this point.
I'm pretty sure we live in the same area (we're in the town with the university), so I can nitpick some of your expenses if you want.
- Cable/Internet: $85
We pay $45 to Cox for 10 Mbps. We stream plenty of Netflix, etc without ever any buffering. They also increase the speed to 50Mbps for free during COVID. I haven't really noticed any difference (telling me 10Mbps is fine under normal circumstances), but I can't say whether it would have been enough for all the the video calls my wife has been on for work.
- Car Insurance: $65
If this is for 2 cars, then it's probably pretty good. You could check out Geico which I've found to be crazy cheap in this area compared to any other company I've gotten a quote from. You could consider dropping to 1 car if that's feasible given where you both work and where you live.
- Utilities: $220
We live in a 750 square foot apartment, we're 2 people not 4, and we're a little extreme with our temperature settings (60 in the winter, 80 in the summer), so consider this just a counterpoint of what's possible if you go nuts. Water/sewer/trash is usually $50-60 (up a bit during COVID with my wife also working from home). If we owned I bet there are some more efficient shower and toilet options that could bring this down. Electric is usually $60-80 in the winter, $40-50 in the summer and $30-40 in the shoulder seasons when we aren't heating or cooling for an average of $45 or so throughout the year.
- Cell Phones: $54
I bet this could come down. Check out
https://www.redpocket.com/. We each have a $60/year plan with 100min/100text/500MB per month, but that requires using google voice for most calls and careful data management (wifi at home and work makes this not really a problem). You could save money even with much larger plans. Check out the annual plans for the best savings.
- Groceries: $470
I have no idea how much kids cost to feed. We average more like $280, but it seems to be going up a bit with COVID for some reason (a bit of stocking up so we could skip a few grocery runs if needed, maybe slightly higher prices, and no work provided meals for my wife). My biggest tip on this one would be to embrace Aldi. Walmart is good for the things you can't find there, but try to adjust to what Aldi offers and I bet your Walmart list gets pretty short.
- Restaurants: $115
- Entertainment: $200
- Personal Expenses (new clothes, new cell phones, makeup, etc.): $150
These are obvious. Leave 'em if you're happy, cut 'em if you want.
- Gas/Oil Changes: $140
This is high, so I'm guessing you live a bit away from work? I work from home and my wife walks to work (except she's working from home right now), so we fill up once a month if that, which also reduces oil change frequency. This kind of thing requires large structural changes to your life, but it's pretty great living within non-car commute distance of work, so worth consider now or if you move for a new job sometime.
As far as the backdoor Roth, check to see if either of your 401(k)s would let you roll the IRAs into them. Make sure they know these are rollover IRAs because some plans will allow a rollover IRA to be rolled in even if they won't allow contributory IRAs to be rolled in.