Only 1 after school activity per child
you cant do everything, so pick the most important
try and plan strategically and not just react tactically
if you can get a babysitter for a few hours a couple of afternoons a week, then they can stay with the younger dc while you take an older dc to an activity and have one on one time. They can also get dinner started
be very firm about bedtimes and dont give an inch on midnight shenanigans. A couple of nights of cross crying is better than you loosing years off you life from sleep deprivation
I allocated each child a colour, red blue etc and then anything that belonged to them I tried to get in that colour or put a sticker of that colour on it. It save hours of trying to remember whose coat, water bottle, school bag, towel, pencil case was whose. Any when towels were left on the floor it was much easier to find the culprit and send them to tidy it up
older dc can and should help with younger dc (age appropriately)
all dc can and should help with household jobs (age appropriately)
dont get too many toys out, put most away and rotate
have a safe space to put the baby that the older dc cant get to, so you can sort out emergencies and know the baby is safe
older dc need a spot to play with small toys, sometimes playpens can be brilliant for playing with legos or playmobils
if a child doesnt want to share a toy, it must stay in their bedroom, anything in joint space is a joint toy
sharing sucks, but taking turns is acceptable
get up half an hour before the dc do and have a cup of tea in the quiet before the day starts
I have 4 dc