Somone in my village has elected to use the ‘put a tarp on it’ school of roof repairs. It’s too costly to fix.
In terms of other things:
Get an evening/overnight second job. Shelf stacking and displays at shops style stuff if what my friend did. No need for childcare as the other parent was with the child overnight.
Remove all days out that aren’t free (including transportation).
Shop cheap and access community pantries for vegetables and bread. There will be one near you.
Meal plan around the Aldi super six (though this isn’t always cheapest now - you need to get well acquainted with all pricing) and what you can get on yellow sticker.
For older kids - ask school whether there is any uniform going spare.
Get on local swap/free sites. If you can’t find it on them, you can’t have it.
Books, board games and toys come from libraries or ‘free to take’ boxes outside houses.
Never turn your nose up at anything. It’s have in the past picked up dumped kids clothes (they were essentially fly tipped), washed them and used them. It was great - they were Boden and other names!
Central heating is start of Dec to end of Feb only. Outside that you need hot water bottles and fake Primark Oodies.
Take out doesn’t exist.
Exercise is via Joe Wicks on YouTube, cycling, going hiking or wild swimming.
If you don’t/aren’t likely to need it - sell it.
It gets better when you don’t pay nursery fees anymore. They’re crippling. A childminder is often cheaper.