Education- in a broad sense, not just Oxbridge. GCSEs, life skills, learning to drive, apprenticeships... The more you know, the more options you have and better insulation and recovery against life-shit.
It's not a complete answer, but engagement with education tends to come with some degree of ambition and direction even if that's modest. Teaching in schools where there is a wide-spread post-industrial culture of poverty of ambition, where the culture is to stay put and repeat the previous generation and there is no aspiration to see and believe alternative future paths is really difficult. Parents can often hold their children back from fear of their own limitations or fear of rejection by children moving onto a different path in life.
There can be phases of life (e.g. young children requiring childcare that doesn't fit with working patterns or is unaffordable) where being educated isn't the answer, and additional resources are, but having the means to access better rates of pay reduces that risk. Education can sometimes open more employment opportunities to people with disabilities or caring responsibilities by enabling better access to flexible or WFH posts- many NMW posts would be inaccessible and be in-person and more physical. Where that isn't a valid pathway then the welfare state and support resources are needed (and still has an important place in supporting the higher living cost disadvantage of disabilities even when in work)
Numeracy and financial literacy can help people maximise the resources that they have.
The more skilled and employable people society has in being economically active, the better society can support the people who aren't in that position be it temporarily or long term. Skilled, employable people have better chances of making come-backs after challenging phases.
My dad worked and educated (at night school) his way out of the post-war slums waiting for redevelopment. It wasn't all plain sailing, there were phases where recessions hit hard and family life was temporarily tipped back into poverty until the next opportunity, but his work ethic, skills and drive to learn and better himself meant that he finished life in very different circumstances to his origins.
Too much has been cut from education (and children's support) budgets, financial support to education and careers support in the past generation and society is suffering for it.