Buy a bigger house!
Do things as they occur -take something upstairs immediately rather than putting it in the stairs to go up when you next go up. Take your coffee fir a walk around the garden instead of sitting down with it.
It's much easier to clock up your steps when everyday actions require more steps, small things like parking the car further away or getting off the bus a stop or two earlier
I live in a very small flat, it's much harder to get in my steps here, than when I live in at work as it's a big house.
Obviously walk when you can instead of taking the car. I make an effort to walk into the village rather than doing things 'on my way out' (in the car when heading out of the village)
Go out for a walk first thing. I like the early morning air & stillness before many people are up & about. Then a walk into the village later on.
At home I'll often make myself 'potter about' until I hit the next 500 or 1000 before sitting down.
I've been slack over the Easter Holidays, but will up my game when the kids are back to school next Tuesday.
Physically doing 10,000 steps I find easy enough, but fitting them in in non work days isn't as easy in my small house.
Good Luck.