For me, 18 months into being a single parent everything was still really raw and traumatic. You have a lot on your plate so keep being kind to yourself.
We always have beans on toast Sunday evening so I can start the school week with a clean kitchen without having run madly round clearing up my mess.
I cook in bulk and freeze a lot so that I make a lot of mess in the kitchen at weekends/holidays and not after school each day.
I've only one child at home now, a teenager so things are easier for me in lots of ways. However his mental health isn't great and his dad only sees him 3 times a year for a week/2weeks. So I am very on my own,my kids are my only family in the country I emigrated to. I've got a good group of friends that I can talk to and off load onto when things get on top of me. I now accept any offers of help that come my way rather than being 'polite'.
I try hard to be frugal with meals and every day life so that we can have fun occasionally. We don't suffer but we eat food in season, eat a lot of cheap (free-range) eggs etc, and minimise waste so we can do the things that are important to us. I'm a teacher so I'm not badly paid but last year I didn't have a permanent job. I was always really conscious of saving up to cover any big emergency bills.
I always read the tips for a more organised life on threads and often pick out one to try to help me.
I've had a lot of counselling over the last few years which has really helped me cope with everything that's been thrown at me. It's made me better at telling people how I feel and not bottling stuff up.
DC likes routine, likes being independent and also being helpful so I try to use that to our advantage. It's about playing to everyone's strengths I think.
This might not have helped you too much but it's been helpful for me to reflect on what I do, so thank you.