Issue committing new changes to development branch

Let’s say I am working on my feature branch A. After all my changes are pushed into the development branch B, it is merged by a senior developer. As per the requirement development branch is merged to master which is done by another developer. So, a developer who is viewing the development branch before merging to master wants changes in my code. How do I commit my new changes? Do I choose my previous feature branch to push new changes or create a new branch?