Homeschooling can take less time than you think! My daughter completed our kindergarten curriculum right before turning 5, and we only spent an hour or so a day really sitting down doing school. She now reads at a 2nd grade level and she’s just 5 1/2! I have a 1.5 year old too, and we just do school when he’s napping generally. If I need a break, I just have her read while I read for half an hour, or watch a movie while her brother naps so I can decompress. Including kids in the house chores helps too, when cleaning up toys and washing dishes become a game the house gets cleaned while the kids are being entertained at the same time! I know it can feel overwhelming but it’s been so worth it to have the freedom and flexibility that homeschooling provides!
Definitely agree with @Kaile - I found our family’s mental health (both mine and the kids) improved with homeschooling! It’s not a classroom where your kiddos have to sit still and “suffer through” lessons. It’s building a lifelong love of learning, “living life together.” I always have a quiet time built into our homeschool just after lunch, when my older kiddos can play quietly and I either nap with the baby or do quiet time on my own. Little brain breaks are literally built throughout the day, so both my kids and I have times of chatter, times of fun, times of quiet, etc. This blog post may also help: https://midwesthomeschoolers.org/teaching-methods-finland-homeschooling/
Same but different circumstances. Our 4.5 yr old twins start kinder next August. Age 4 has been SOOOOOOOO difficult. I'm a SAHM and work from home, too. I'm already overwhelmed with both of them but hope by next year they will have chilled some. I also have severe ADHD and have been struggling to get going in the morning since both kids still wake in the night. It's exhausting.