I think I'm pretty much on top of house "stuff"...
Costco run once a month for toilet rolls, laundry liquid, meat, etc.
Upstairs cleaning cupboard duplicates of cleaning things
Decluttering is a way of life here, one thing in, at least one thing out.
Post/paperwork touched once and either filed or shredded
Shopping collection once a week.
In terms of life - don't sweat the small stuff, get good at saying no. Just because someone asks you, it doesn't mean you have to say yes.
Fill your jar - big rocks, small stones, gravel, sand.
Learn to love yourself. You are important, there's only one of you and you need time to be you, not a daughter/sister/spouse/mother or friend. You aren't perfect - no one is, so if you strive to be that perfect version of yourself, chances are you'll lose sight of who you really are.
A problem shared is a problem halved, so talk, get it off your chest, but don't take on other people's problems (children aside) empathy not sympathy.
Life is very short, don't prioritise dusting the skirting boards over a cuppa with a friend - they will be dusty again tomorrow.