It's obviously not possible for everyone, but my family would give up a lot of things to fit a cleaner into the budget. Even every other week helps - that reduces the bathroom cleaning, dusting and mopping in particular to pretty low-level maintenance. It's usually more affordable than most people think. And the bonus is that it creates a built-in "deadline" for the family to have rooms tidy and ready to be cleaned. When I was a kid the house rule was that if our play room, bedroom and bathroom wasn't ready for the housekeeper (everything off the floor, clean sheets ready to be put on the bed, toiletries off the counter and bathtub ledge) then we got to spend the next Friday evening or Saturday scrubbing it all ourselves, and that's the same rule in my house now.
I don't know if that's just off the table for you, but regardless I would prioritize setting clear expectations from the entire family as your schedule changes. 8 and 10 is well old enough to have regular chores. My DC all pack their own lunches, fold/hang their own laundry (at least), help some with either prep or cleanup for dinner every night (they usually get to choose which), and have 1-3 age-appropriate household-maintenance tasks (approx. 10 min per day on average) that they do regularly to earn their pocket money. Right now my middle-aged kids are in charge of vaccuming or sweeping the mud room, play room and entry-way, taking an all-surface cleaner and cloth to the bathroom vanities/sinks/mirrors and quick brush to the toilet, taking out the kitchen bins, managing the shoe piles by the doors, and feeding the dogs. Give them some options (a variety of tasks, some that will be quick but daily, some that will take longer but be weekly) and allow them to rotate. Set expectations for them regarding picking up after themselves after all snacks and meals, when playing in shared spaces, and "if you drop it, pick it up." They know and do this at school already.
But I'd start all of this with a direct conversation with your DH. Tell him your increase in work hours means home tasks will need to be split evenly and ask which tasks he plans to add to his list. Look at the family budget to see what you can trim to add a bi-weekly cleaner.