How top stop bot traffic spam to my site?

Hello, I need some help.
One of my blogs started to receive bot traffic spam a few days ago. I get about a hundred clicks to my blog every day from one spam site.

I tried a few plugins to block bot traffic but it doesn't stop.

I even banned the website in my .htaccess file but it still shows up in google analytics that I get referral traffic from that domain.

Does anybody know a good solution to this problem?

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