How can I save my plant?

I am sorry, I don't have good suggestion, I'm afraid it is a lost case.
in the future, if you growing a new plant, perhaps better avoid those wood chips, compost, or any un-mature composts and organic material, especially on seedling and new cuttings, as they (together with too much moisture) bring the risk of fungal infection, mature plants can handle fungi, but seedling will damp off dead.

Bright light and a lot of hope.

Take it out of the pot and look at the roots, if they are mushy, throw the plant in the garbage. Use a better potting mix for your plants and they will be a lot happier in the future. Sorry we couldn't give you better news

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