I have three with one on the way. It’s a constant struggle to keep the place livable. Before I had children I was not a neat person and kept things livable by not doing things that made mess and staying out as much as possible. Can’t do that with kids, so what’s the trick?
Minimize the amount of things (as much as you can), designate specific areas/rooms for the piles of toys/ games where you can let things get messier and get rid of the ones nobody plays with that just take up space, get the kids into the habit of putting things back (if possible you can even have the oldest eventually ‘supervise’ the others as long as that doesn’t lead to even worse fighting), or just pick a weekend day that you just put everything back together so at least you know you can get it back to normal and feel less bad about it when it’s a horrible mess on a Thursday evening.
Also paper/plastic plates and utensils when it’s all just too much. Not great for the environment but the lack of a pile of dishes may be worth a lot of mental health.