The meta keyword tag isn't used by modern browsers (more info). It's only used by competitors to see what keywords you are targeting 
As Kay mentioned just keep it natural, if you feel its light then maybe you need more relevant content.
Latest posts made by Axios_Systems
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RE: The Keyword density in a landing page is very low . by adding meta keyword tag can improve keyword density?
Best posts made by Axios_Systems
-
RE: The Keyword density in a landing page is very low . by adding meta keyword tag can improve keyword density?
The meta keyword tag isn't used by modern browsers (more info). It's only used by competitors to see what keywords you are targeting
As Kay mentioned just keep it natural, if you feel its light then maybe you need more relevant content.