How should I help the children?

Hello folks.

Here's what it's about: I was torn from my family at the age of 15 because my parents kicked me out. So, I was suddenly placed in the care of a foster family. It was traumatic for me. I had to change schools and my place of residence, and I had no contact with my biological family for a long time.
In the beginning everything was great, I received support from the foster family, they practically gave me a new home and a new perspective.
But over the next few weeks, things got strange. Then things took a turn for the worse. They started talking badly about me behind my back (well, I still noticed it). They denied me contact with my parents (we slowly started to get back in touch). The other kids also gossiped about me a lot, and no matter what I did, it was passed on.

But I thought, oh pull yourself together.

But then I was inundated with tasks. The family has a huge farm with horses and everything.

I had to do tough physical work that pushed me to my mental and physical limits.

I and another child had to run the household on our own, sometimes cooking and looking after the other foster children.

I worked part-time to get my driver's license and got a good degree.

But the work was too tough.
I was threatened that if I didn't do this I would be put out on the street.

We had to transport kilos of sand from A to B. We had to clean the stables every day. Sometimes the horses were kept in the stable for days because the weather outside was bad, so it was quite exhausting to clean the stables. We had to transport stones weighing several hundred kilos from A to B so the stables could be built.

But we did that alone, while the adults sat in front of the TV.

I fought to be able to move out earlier, but no chance. I moved out immediately at 18. Now I often think about the other children.
What can I do to hold this family accountable?
The youth welfare office let me down completely.
The family isn't worth having more children living with them; they'll just keep going like this. With the money that would otherwise have been available to me, the children went on vacation for days.

Why is the system like this? Why are we being abandoned like this?
Has anyone experienced something like this or noticed anything?

and what options will I have to “save” the remaining children?
From my own experience, I know that it won't be any easier for them.

I am truly shocked and still so angry.

Thank you for reading 🙂