Rather than get a whole new complete bike, why not do a tire or wheel upgrade. Your internal gear hubs and belt drive situation is really well suited for your intended use. The thing is though, commuters often tend to want steel-belted garden hose tires for flat-resistance.
It's really not hard to save 30+ (or more) watts of effort and easily well over a pound of rotating mass by switching to a tubeless system with high quality tires.
A wheel build on your existing hubs would be spokes, rim, & labor. High quality aluminum rims can be had all day on either side of $100, expect ~$100 labor & $35-70 in spokes. $500 is a reasonable cost. You could save $200 by building the wheel yourself.
Another ~$80 for rim tape, sealant, valves, sealant injector, miscellaneous.
Then another $35-70 per tire depending on sale prices/availability, etc...
The whole project would cost a third of your new bike budget & yield a much faster, more capable & flat resistant bike to commute on.
The caveat after the initial investment is the occasional checking & topping up of sealant level. Which is fine because you should be checking over your bike at least that frequently anyway.
Having said all that, the Giant Revolt, even with the $1000 price increase that happened in the 2022 model year is a really strong bargain for a high quality bike.