Consider changing some of the routines. We have a basement playroom and use going up is much better than coming down. But you can teach them all to crawl down backwards and insist on that as long as you want. Then it means all of them are coming down at the same time just slowly. I don't let them sit forward and bum down because it is too easy to lean forward or get foot stuck and fall forward so they must turn around and crawl backwards.

That then means you don't have to carry anyone except maybe the youngest for a bit longer. It will get better each month as they get older.

Look at he sleeping and see if that can be rearranged to put the best nappers in the same place and let the criers cry it out together or put one that sleeps through anything with a crier since it won't matter.

Keep meals simple, outings to a minimum if at all including to the park if you have access to a back yard. Get a stroller/wagon for 5 and make them all ride and go for walks to get out - ie everyone is contained.