Assume your mortgage payments went up (ours more than doubled) after the Liz Truss fiasco - the rates are coming down atm, so would suggest exploring whether you can move/change your mortgage?
Childcare costs are, although, painful, temporary. They will be at school before you know it, so it’s a case of suck it up - unless you have room for a live in au pair or can do a nanny share? Several friends of mine did the au pair route for a few years. Not the easiest option as you have responsibilities to the young person and it does affect your privacy, but it massively reduces costs.
Are you over paying into pensions? Could you reduct those until after the kids are at school and you have more cash on hand?
In addition, it really is worth checking things like switching broadband, utilities and mobile phone providers - we were paying nearly 100pcm for fibre/broadband, after a cheap deal set up during lock down. Our neighbours got it at £38pcm from the same provider as a new customer! Clearly we cancelled and moved providers immediately, but it made us look at utilities etc. If you’ve not moved any of these for more than 3 years, you may be paying a premium for being a loyal customer that is, frankly, criminal as it doesn’t come with benefits. Sky also cut our monthly bill by 35% after calling to enquire why new customers were being offered new contracts for less than we were paying.
It’s easy to assume you are paying best price, when complacency means they are just fleecing you. On your salary, you shouldn’t feel as though you are missing out. We cut hundreds off our monthly bills this way - and did much of it online, so fairly stress free. We now do an annual review of all this stuff.