Both my husband and I left teaching after our first was born.
He did recruitment for a local supply agency (not from home). Then did WFH recruitment for international teachers. Pay is pretty shit compared to teaching. And he doesn't really enjoy it at all, but doesn't know what else to do!
I probably wouldn't have left teaching if we weren't relocating- I can't teach where we are now without further qualifications which are pretty unattainable for me. I'm a self employed photographer which is something I developed alongside teaching for about the last 10 years. I would have gone to part time teaching if we hadn't relocated, as I couldn't really find anything that had the same level of pay and taking into account the holidays.
But getting into the right school is key. I once got a 0.5 job (but didn't end up taking it as something else came up) just taking catch-up groups every morning. Would have been perfect in terms of work-life balance. I've also got a few jobs in the past by just emailing every schools in the county directly with my CV - I got a one day a week PPA cover in one school and an afternoon per week doing 1-1 maths tuition.
IF you could stay in teaching, supply agencies are desperate for decent teachers. They will get you in for part time, temporary roles.
Have a look at civil servant jobs- they're meant to be quite flexible. I know you said WFH, but honestly, it's not the best way to go necessarily unless it's just commute time you want to cut out, because there's no way you can WFH with a child in the house anyway, so you'd need to use childcare. DH hates WFH full time, never getting out of the house and seeing anyone. I'd only go for it if you have an active social life outside of work.
With English qualifications, self employed proof-reader or similar might be an option to be able to choose your own hours, but I've no idea how you get into that!
I think most things you'll find will be a significant drop in pay, plus only 4 weeks holiday per year. I've seen a few people on these threads say they found a job with similar or higher pay, but I don't think it's the majority, and I don't think they'd be WFH either.
Good luck