Start a unique blog discussing (and addressing) social issues and injustices. This topic has gained importance over the years and there needs to be a blog where people can read about and share their ideas/comments.
Showcase your passion for social justice and advocacy. You can cover topics like racial inequality, gender discrimination, or environmental issues. There is no dearth of problems in this world. Problems often attract readers to an article or blog.
You may want to invite donations from the general public and sponsored content from nonprofit organizations. So there can be a revenue stream as well while raising awareness and making a positive impact on society.
Blog Name Idea: ItsUnfortunate.com