I have a teen and have been a lone mum since he was 2, no support from ex or anyone else.
I prioritise. Basics come first. Food, warmth, security, money, time to focus on ds every day. That means working full time, early mornings, involving ds in everyday choices, chores, cooking, never having a day off etc.
We work as a team now he is older, and have done since he was about 10. Before that I shrunk my world down to cover the basics, and then added in whatever else I could manage.
My house has never been a show home - cooking a hot healthy meal has always come before hoovering, and my social life didn't exist for the first 10 years because ds couldn't be left. I went running in lunchtimes. Didn't waste a moment of the day.
It's hard work, but it can be done. I'm just coming out of it now. Ds finished school yesterday. I'll never do a schoolrun again. Or a parent's evening. It feels slightly odd, knowing all those rules no longer apply. 😊