What is the solution to the main problem in Stella by starlight?

In the book "Stella by Starlight" by Sharon M. Draper, the main problem is racial injustice and prejudice faced by Stella and her community in the segregated South. The solution is found through the resilience and courage of Stella and her family, who come together with their community to stand up against racism and work towards a better future. By raising their voices and taking action, they are able to make a difference and create positive change.