Your keyword limit is determined by your plan:
This is the total amount of keywords you may add across your Rank Tracker projects.
A single keyword tracked across several locations counts as several keywords.
For example, you are tracking the keyword "best backlink checker" for USA and UK.
This counts as 2 keywords from your tracked keywords limit. We do not limit the number of locations you can add, only the number of tracked keywords.
If your total tracked keywords exceeds this limit, adding keywords/locations will be disabled.
*Note that even if your plan’s limit is more than 10,000 keywords, each single project can only track up to 10,000 keywords.
To check your subscription limits, you can go "Subscription plan":