Oh bless you. Firstly, carve out some "downtime" for yourself during the day. Like, get up, have breakfast, take kids out somewhere active but not exhausting (a walk, the park, jumping in puddles given the current weather!) come home, bit of lunch, then everyone has at least an hour chill out time. Kids have screen time, you do whatever you want (bath, TV, phone a friend, whatever). And because they've had no screen time in the morning, and they're pleasantly tired from a moderate activity, and they're well fed, they're likely to give you an hour's peace.
Then in the afternoon do something togetehr- another short excursion, an activity like painting or something, a board game if you're feeling brave, or just that awful thing where you have to play paw patrol for an hour (seriously, I hate playing those sorts of games!)
Then they can watch a bit more TV while you get the tea ready, and after tea everything has to be calm. Start bath time as soon as tea is finished, so you can do it as slowly and calmly as you need. Just one or two stories after bath, then bed. I personally sit with mine, but if there's any pissing about I walk out. And I'm soft, so I give them lots of chances- I keep going back in, and I'll stay as long as they're lying quietly in bed, but any chatting, or getting up, or even sitting up playing teddies, I walk out again. No idea if this is the "right thing" to do, but it's a compromise that works for me xx