Flutter plugins are great for accelerating app development. Contributing to the community by sharing a plugin is also great; however, there are few points to consider when planning to publish a plugin to make it really useful and accepted:

• Support multiple platforms: Plugins that target a single platform go wrong from the start. Since Flutter is a cross-platform framework, we need to think this way, since the plugins will be used to create applications that will run on multiple platforms.
• Write good documentation: Flutter provides tools to make it easy to create and publish a package with all the documentation; the only task required is to write this document.
• Search for existing plugins first: Maybe you are thinking of developing another plugin on Flutter, but you should search in pub first to check whether it's already developed by other developers so that you can use and even contribute to it:

Writing a good, focused plugin can be really helpful to other developers. Do not hesitate to check out the existing plugin source code and learn how to make great tools for the community.