Want to delete all the existing 
on your instance? Here is how you can do it.
Access your site
First connect to your Droplet via SSH, and enter the Docker container for your Discourse instances:
cd /var/discourse
./launcher enter app
WARNING
We strongly recommend you take a full backup before proceeding.
Delete all the likes
rake posts:delete_all_likes
The above command will delete all the likes on your instance.