How do I ensure no one has remote access to my droplets?

I’m really new to DO and trying to secure an account. Someone who used to have access claims to have SSH installed and thus has some level of remote access. I can see under Applications & API Access there’s a Digital Ocean API listed. I’m not sure if I should revoke it or if that’s likely to break something else.

Any direction would be appreciated!

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You can sign in to your droplet and look at this file: ~/.ssh/authorized_keys

If your droplet is configured to only allow login using ssh-key you can remove every line here except the one for your pc/mac.