Get an Antivirus
Similar to using a firewall, you can get and set up an antivirus to add an extra layer of protection to your Mac. Antivirus is great for finding any possible loophole in the system that could either be malware or another threat. It then tries to fix the issue by itself.
What’s great about antivirus software is that the companies behind them are always keeping up-to-date with newer threats, and a clear example is the Silver Sparrow malware that started infecting Mac computers a few weeks ago.
The best part about getting an antivirus is that many companies offer basic protection for free. There are many antivirus apps you can try before committing to just one.