Here is a list of things to make sure to remember before publishing your Visual Studio extension.
Add the Microsoft.VisualStudio.SDK.Analyzers NuGet package to your VSIX project, which will help you discover and fix common violations of best practices regarding threading.
All extensions should have an icon associated with it. Make sure the icon is a high-quality .png file with the size 90x90 pixels in 96 DPI or more. After adding the icon to your VSIX project, register it in the .vsixmanifest file as both the Icon and Preview image.