Robot hoover set on a timer to go round twice a day.
Most clothes go in the washer dryer so they can be put away as soon as they're done. Also try to get a couple of wears out of things before they get washed but not always possible with messy kids.
Clean as I go and use any bits of downtime to get some cleaning or tidying done so it doesn't get overwhelming.
Batch cook as much as possible and have a large freezer so there's always something that can be pulled out for dinner.
Declutter and get rid of anything that's not needed as often as I can. Makes cleaning easier and feels better to have a clear space. Use digital formats for books, music, films etc so it's not physical stuff.
Get as much ready the night before as possible. Particularly for the kids, their uniform ready at the end of the bed, snacks and books ready in school bags, water bottles in the fridge so they can be put in the bags in the morning, DD's violin in the car so we can't forget it. Do the dishes the night before so it's easy to make breakfast in the morning. Also kids have school dinners so I don't have to think about packed lunches.
School events go straight on my phone calendar which shows on my home screen so I can easily see what's happening. Any dress up days I just count as non uniform and let them wear what they want, simply don't have the time or money to be sourcing costumes they'll wear once.
Use Monzo for banking and have a separate pot for each direct debit, means it's easy to budget and manage each bill.
Use an app to manage Xmas and birthday gifts and buy throughout the year. Don't bother with cards as they usually just go in the bin anyway.