Firewall rule against bad bots

Hi,
I am using some firewall rules namely:

  1. Allow good bots and bots for services I use.

  2. Js challenge traffic from countries other than top 25 countries from which traffic comes to my site.

  3. Js challenge for threat score equal or greater than 10.

How can I better secure my site from bad bots from those 25 countries? I don’t want to hurt user experience.

Other than that, I also want to know what is optimum security level and cache period.

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