I agree with you it does get very tiring.
I've been in a similar space for about 5 years though it's improved massively in the last year.
What helped was qualification in a better paid role. I did a degree whilst working night and it's started to pay off.
I do still struggle and yeah it's hard. But I've found some things helped. Namly downsizing my home has helped hugely, for context I had to anyway as I divorced but the running of a bigger home was horrendous in the last 2 years. I have halved the size of my house and much happier. Everything is cheaper. And I moved to a cheaper area outside of the south east, this also helped. I have 4 children so I have to be somewhere affordable for the foreseeable. It's been a good thing for us.
The above 2 are big decisions I know but some smaller day to day things helped as well. For Christmas and birthdays buy kids things they needs like fun toothbrushes, nice shower gels and body washes, shampoo sets etc. This helps during the year as I'm not replacing loads. Stocking are also filled with socks, underwear and stationary type things that they need and some books.
I use the cheap washing powder from Lidl or Poundland and pop a handful of scent booster in. The scent booster bottles last ages and the clothes come out clean and is cheaper than buying branded powders. Cleaning stuff I have polish, reusable washable clothes and then washing up liquid and bleach. I have a spray bottle which I put bleach and water in to make a spray. Saves my keep buying it.
I use bar soap instead of shower gel and hand wash. Much cheaper.
Clothes and other stuff is mostly second hand which I prefer as it's unique. When I moved I bought stuff off market place with some great results.i do buy new school uniform though.
Learn to do jobs round the house yourself rather than pay someone to come and do for you you.
I drive an old car that isn't on finance, I feel trapped by debt
Hobbies for us is walks in the beautiful countryside where we have moved to with our dogs. A trip to the library. We are much happier here than when we were struggling in the old place.
My 15 year plan is when the kids have left home again I will move another county to see out the last bit. Houses are cheaper and it's more pretty, Norfolk or Lincolnshire.
Dhal is great but boring. We have a lot of the same meals, beans on toast, chickpea curry, egg and bacon on toast or pastas it's shit but more than some have. Keep going it won't always be this way. Diet is one thing I struggle with as obvs give the kids all the fruit so my diet is limited to frozen veg and two bananas as they are the cheapest.