Keep them! SEO gains can take time; dropping a keyword too soon can undo work.
It’s always helpful to keep tracking the keywords you’re ranking for, so you can see how they perform over time. If you want to track more keywords, you absolutely can.
Here’s how:
Go to Keyword Research
Click on the …/100 chosen keywords section
Then click “+ Upgrade” at the top to increase your keyword limit
This way, you can keep tracking your current keywords and add new ones too!