You’ve most probably exceeded your keywords allowance. You can either delete some keywords or upgrade.
Each plan is set up to track a different amount of keywords.
Starter plan: track up to 200 keywords
Guru plan: track 2000 keywords
Power plan: track 6000 keywords.
You can delete some keywords at any time by going to "My Account > Plan Usage".
Note: if you track same keyword in two different stores, countries or languages, it counts as two keywords.
If you need more keywords, we can create a custom plan just for you! Feel free to reach out at email@example.com.