Alternative Antivirus software to Webroot Secure Anywhere

Do not install any third party antivirus apps. They are not needed, use system resources while providing no benefit, and they may cause problems.

macOS - Security - Apple

Protect your Mac from malware - Apple Support

Effective defenses against malware and ot… - Apple Community

With macOS Catalina's built-in security features, no AV app is required, so no alternate AV solution can be recommended.

You don't need anti-virus software. YOUr Mac has it built in. That's all you need and a little common sense.