@2135542namechange First of all, you can't really cure eczema. You can get in under control, but there's no magic wand to make it go away, so you need to reframe the way you are approaching this.
What is the name of the steroid cream you were using?
What type of eczema is it?
Have you identified the triggers?
Often eczema is triggered by exposure to allergens which are mild enough to prompt an eczema response rather than kill the person, but because they're so mild, it can take a while to link the eczema flaring up to what caused it. Allergy testing is therefore so vital - it's worth getting tested for all the common allergens plus anything unusual from your life that you think could also be a possibility.
Some people's eczema hates the cold (it makes skin more prone to cracking) or the heat (the sweat irritates the skin) so general environment can also play a part.
Personally, whilst some emollients are better than others, I think they're generally all good. The important thing is access to steroids of the appropriate strength for the flare up and avoiding triggers.
It can feel miserable having eczema, and I have no doubt as a parent it can feel miserable watching a child suffer, but most people do eventually find a way to control it and to minimise the impact on their daily lives. Hang in there.