Totally agree with early posts:
Be selective what you say yes to - don't sign up for every PTA/community volunteering going. Just one, and agree to things you do easily. Don't be treasurer if you are rubbish at maths or campaigner if you are shy.
Keep clutter to a minimum.
Also: pick your arguments. We have a very peaceful family because we just never ever shout about the small stuff. If DC leave towels all over the bathroom floor I just say in a non-accusatory voice: 'Love, you left towels on the floor. I need you to pick them up right now so I can clean/use the bathroom/put on a wash load.' And they always do without a row because there's no power struggle involved.
Have small, simple routines. I like Flylady's room rescues and weekly house blessing. Get everyone to help clean the house for 30 mins on a Saturday - DC and DH too. If everyone works together, the house is transformed in under an hour and then you can all go about your days and come home to a clean, sweet-smelling home.
Other things:
Make easy weeknight dinners - chicken or salmon tray bakes or one pot casseroles, stews, chillis, ragus etc. Have one night a week of ready meals - either supermarket takeaway indian/chinese food or just cheese, crackers, fruit etc or frozen fish and oven chips - stuff that takes 5 mins to prep.
Make boring things fun. Put on great music or podcasts when you clean the house. Reward yourselves for doing dull stuff like clearing the garage or decorating a room with a night out.