How do y'all do it?

I have twin 7yo and a 6yo.

I've had my kids 50/50 since 2/25, 2 weeks on 2 weeks off. By the end of week 1, my house is a mess, I'm exhausted everything has fallen to the wayside besides care for the kids. I would never give up 50/50, I'm just wondering how y'all do it?

Normal schedule

Up at 430

Kids up at 530

At school by 630

Commute till 7ish

I have to leave work at 3 or I won't make it to pick them up on time at school.

Home by 430-445

Relax for 15-30 min

Prep dinner and eat till 630-7

Play with the kids for 30 min

Start baths and next day prep

Bed at 830

30 min to try and pick up/ dishes

Sh**, shower and unwind.

Bed by 10-1030.

I was able to sustain 6 hours of sleep for a long time, but it's really starting to effect me. I'm late a lot luckily it's not a huge deal in my line of work but I don't want to be that guy never on time, and my guys are waiting on me. One day it will catch up and it will become an issue.

I only have one real person to help me and it's my sister but she has her own job and kids and husband. My mom passed away a year ago and my father has his own new family.

I'm kinda drowning and don't know how to save myself.