I'm more about carrot than stick, so would stop means-testing everything, so that people could save or work towards a step up (promotion, pay rise, pension fund or whatever) without losing money that is free to those who neither save nor work.
I agree about increasing MW and stopping top ups. I'd make child benefit universal, but only for households with both parents working at least 20 hours a week each, unless there is good reason why they can't, such as disability, caring responsibilities or studying. Ditto nursery provision.
I would stop Right To Buy immediately, and offer incentives to people selling rentals to local authorities to increase the numbers of council houses. I would also increase taxes on private rents and ring-fence the proceeds for more LA house building, so that ultimately there would be enough to make them available to all who want them. No fixed tenancies, no ghettos and fair rents.
Rather than fining parents who take children on holiday in school time, I'd have heavily subsidised residential trips for children who attend regularly. Also school lotteries with tickets going in a 'hat' for every full week/month/term of attendance, and a decent prize that children really want (not a dictionary or pencil case 😀). Tickets could also be awarded in the same way as house points, for good behaviour and other achievements.
I also approve of free school meals for all - not means-tested, very little choice, and all healthy. Probably vegetarian, so all religious groups can eat the same things. I wouldn't allow packed lunches other than for those on special diets with some sort of proof of reason, and would give out recipe cards (or online versions) so that parents and older children could make the meals at home.