I've never grown Comos indoors so perhaps it just wants to be outside?
Yes - it needs overwintering inside in the UK, but it should be outside. It's probably fried.Are you in the UK or elsewhere?
green fingered finch said:
Aren’t they annuals?
Chocolate cosmos is perennial but a bit tender. It does look a bit cooked 😢
The plant is getting swamped by other plants in the pot and the base has very little space for it to grow and expand. They are delicate plants and best grown on their own. They should be able to deal with a sunny area, provided the soil is moist but also free draining. The way it is leaning, I think they are reaching for the light.