1. Stay on top of basic cleaning
Dirty places smell bad. The solution is cleaning, so do it.
But you don’t have to do it all at once. Instead, focus on just one thing per day: Empty the trash or scoop the litter box, but not both. Vacuum one room, and allow yourself to stop.
Load the dishwasher immediately after eating. Sweep the entryway to keep mud and muck from being spread throughout the house. Start laundry before dinner and put it in the dryer afterward.