First of all check this user guide on how to manage inode limits on your free hosting account: Everything you need to know about Inodes
Here are simple tasks that you can perform to reduce inodes on your wordpress installation:
- Remove any un-used plugins and themes. Not only “deactivate” them but completely remove the files.
- Remove any media files like images/videos that you are not using in article/product. Wordpress doesn’t remove un-used media automatically.