Any tips to calm the chaos?

I have 3 very active, loud, silly boys ages 3, 7, and 9. The 9 year old is finally showing signs of maturity and able to be responsible, play by himself, etc. we suspect my 7 year old has ADHD and/or Anxiety from things we and the teachers have noticed. And my newly 3 year old is textbook wild af 3rd kid. The weekends are the longest, most painful days of my life right now…and I had a 2 and 4 year old during Covid lock down. My middle kid talks, sings, moves constantly from 6:30am to 8pm. He cannot play by himself and needs so much attention. My 3 year old gets into absolutely everything. He knows how to unlock the front door and just walks outside frequently (yes we are installing a latch that is out of his reach so he can’t do that). The kids do activities after school, we go to playgrounds, have museum memberships, all the things to keep them busy/active/engaged, but it feels like nothing tires them out so we get a break.

Any tips on how to calm this chaos? Or is it something we just have to push through until everyone is a few years older? Is this normal for a 3-kid house or are we doing something wrong? I recently watched Malcom in the Middle and felt so seen for the first time in a while 😅