Learning react and nextjs

Noticed recently learning react.js and next.js opens a lot of interview opportunities for sure. But always lacks in strong projects; these todo apps, clone applications are really no-brainer. Also, when I want to focus on the frontend part, application development often demands full-stack to complete (courses and tutorials). Can you suggest something where I can build my strong web app building skills in frontend and at the same time I solve some real wor