A: Hey Monsur,

Keyword suggestions are available in the original Sumo plan:
https://help.serpwatch.io/docs-v2/getting-started/how-to-add-projects/keyword-suggestion/

And Keyword Research is the premium add-on, that is currently available at a special offer:
https://help.serpwatch.io/docs-v2/getting-started/how-to-add-projects/keyword-research-tool/

You can read more about add-ons here:
https://serpwatch.io/appsumo-premium-addons/

Best! D.