We had a major Smush api outage on Monday, I'm pretty sure this is the root of the problem. Can you confirm all is well now?

You can do it with a small snippet of code. There is a txt file with sample code in the plugin's zip file/directory.

I’m not sure exactly what you are needing here. DDoS protection could never be fully provided at the hosting level. You can use a provider like Cloudflare if that is a need for you. There is a lot that goes into security for our servers. Some examples are incoming/outgoing firewall, brute force protection on ssh/sftp, automated package and software updates, hardened permissions and php configs, redundant offsite backups, ssh key support, etc. Then you have all the tools provided by Defender plugin which is built in.

We've rebuilt your server from last backup. If you had any domains associated with it you may need to change DNS, you would have received an email if that were the case.