OP you have my sympathy.
The pile on about wanting the "luxury" of part time work in your current situation is quite mind boggling. You have forged a career around your family commitments which is what women are now expected to do, which while it might not sustain you as a single parent worked well in the circumstances while your DH was employed, and has potential long term benefits and security.
Your DH has been dealt an unfortunate hand, and you are trying to work round getting back to a situation where benefits won't be necessary.
The pandemic shafted so many people and has made the entire world economy unstable. Employers hold the whip hand - zero hours contracts are a blight on society, and this rose tinted view that you can just waltz into something that will solve all your problems is risible.
People forget that one of the primary motivations for setting up the welfare system after the war was to prevent civil uprising and revolution as disgruntled soldiers coming back from war to economic chaos had to be appeased.
Down the line it was used for the same reasons, when we lost our industries in the Thatcher years, and so on.
Institutional gas-lighting and propaganda is used to claim that anyone needing even a short period of assistance is feckless, stealing from their community, etc etc
It is over-looked that long term economic insecurity leads to family breakdown, poor mental and physical health, homelessness and crime. There are industries now around these issues which would collapse if the world was a more equitable place, which cost a huge amount to administer yet also allow profiteering as capitalism is king and funneling money from the worst off to the most wealthy is the ultimate goal.
A population constantly on the brink of financial security is malleable - keep offering "just enough" and "jam tomorrow" with the implication that any period of personal difficulty is simply down to lack of resilience etc, and people will exhaust themselves to comply, because without hope there is nothing.
Everything appears to be falling apart - my local council has been reported today as not considering it financially viable to maintain our hollowed out town centre despite being a tourist destination that is becoming less and less desirable to visitors due to lack of retail - even big chains are gone - and the proliferation of social problems and crime. Not sure what the end game is but I'm more alarmed at everything at 55 than I have ever been before.
Anyway, back to the point - I wish you luck OP, as it's clear you're just trying to get by in a world very different to the one where getting a job didn't demand degrees and experience for the least little role, psychometric testing and for everyone to worship at the foot of money and technology. I really do wish you all the best.