Great ideas on here!
I’ll be washing my family’s clothes separately from now on, it makes so much sense.
You can simplifying too much though - it should be prioritising things meaningful to you and cutting out the rest. Some posts sound a bit closer to not bothering with life because it’s effort, which is more like avoidance & depression. Been there!
Think of life like a video game - you get your character to explore the terrain, try the activities, talk to the people, get coins, exchange them for items that make their experience better / easier, or a new look, for fun. You wouldn’t just sit them in their little hut doing nothing with nothing 
Back to the question, some ways I’ve simplified:
- Drawer dividers! I enjoy putting socks away now!
- A metal square thing with many pegs from Amazon to pin paired socks and other underwear on to dry
- upgraded to a larger clothes airer - more space between clothes now so they dry faster
- realised I don’t do anything “formal” anymore so no more storing clothes for such occasions just in case
- worked out the types, cuts and colours of clothes I like to wear and now set my searches accordingly, only looking at what’s in my size.
- wrote a wish-list of perfect basics to look out for and buy multiples of
- junk mail goes straight to the recycling, mail opened and dealt with straight away, filed or disposed of
- a filing folder with sections close to hand - keep important letters, birth certificates, passports, instruction manuals..
- go paperless wherever possible (bank, utilities)
- say no to favours, never ask favours yourself (let’s all deal with our own shit)
(This doesn’t include my kids, or giving anyone advice, emotional support, etc. But I won’t wrap your Xmas gifts because you proclaim to be “rubbish at it” (practice!) / learn to drive so all the CFs around us can use me for lifts. Ahem.)
- Areas of floor. I just love them. I got rid of things that have no use, plus the furniture it was on and now those areas get a quick vacuum instead of 30 minutes with the brush attachment. (So much room for activities!)
- No social media. Just Wattsapp and genuine relationships only.
- Looking at a calendar of the whole year and plotting in nice things to break it up, taking into account school holidays and birthdays.