i really sympathise OP, and I remember very well how challenging it was at that age. I muddled through but made loads of mistakes as we all do.
i have to say, consequences didn’t work at all with mine, but natural consequences did. That would mean leaving outings early and so on, but rather than framed as a punishment, it would be oh well, you are obviously tired/hungry/not managing so I am taking you home.
i would also not battle about clothes. So they get wet/cold. Sunscreen was not negotiable though but again was a natural consequence - we can’t go out/ have to go home because otherwise you will burn.
Ignore tantrums. (Actually I genuinely did not consider them naughty, I thought that it was the only way they could communicate an emotion in line with their cognitive development). But I would remove them from situations that that were unsafe or disruptive to others.
Making a mess - less toys and stuff around - we rotated. Remove into a bin bag if necessary for a time but don’t through out or threaten to do so. I would ask mine to put toys into boxes at the end of the day and if they refused I would say that I would tidy up and put them away for now, and put them in a bin bag. Again, limited accessible clothes. Any art/ drawing/ craft things were not accessible and those activities supervised, same with games.
My older one was better at settling at night. Bath was a bit earlier on, because it would perk them up! Books - never removed in advance but I sometimes stopped reading if they were messing around - it doesn’t seem as though you are enjoying it. My younger child (now known to be ADHD/ ASD , wouldn’t snuggle and listen to a book and I realised that she needed to keep moving whilst she listened but she did follow and remember every word. So there was a mini trampoline and a yoga hammock thing in the bedroom, and that worked well. Bedtime routine was the same every night - they chose a book each and then we finished with the same book etc. daughter did co sleep, I lay with her with my kindle until she went to sleep, if she mucked about, I would leave.
Hitting each other I fussed the aggrieved party and ignored the aggressor. Play fighting I ignored and wasn’t sympathetic if someone got hurt.
Hitting me - if they were having a tantrum/ disregulated, I would do ‘time in’ - eg hold them in such a way they couldn’t hit me but giving comfort. If they were being naughty / cheeky and refused to remove themselves (as opposed to time out which didn’t work), I would remove myself and leave them to it.
Lots of attention and praise for good behaviour.
Lots of tiring them out and physical challenges.
Outside as much as possible rain or shine. Woods, parks, beaches etc.
But gosh, it was bloody exhausting. And some days just had to be shrugged off as a bad day.
I was stern and would get cross and had high expectations about politeness, kindness and so on, and luckily they were well behaved in other settings, it was only with me that they were (often) little sods!
You just have to take it a day at a time. And try and carve some time out for yourself, even if it’s a leave day whilst they are in school/ nursery.
You can do this!