Block complete domain extension ( .to / .ru / .xyz ) referral / referral spam with .htaccess - .htaccess

Question

I am having a lot of referral spam in my google analytics like a lot of people do. Because this spam is coming from domains with a specific extension like .to, .ru or .xyz, I would like to block those domain extensions completely.
I searched a lot and found several .htaccess rewrite rules and applied them in several ways without result. Option 1 and 2 were placed at the end of the .htacces file. Option 3 is placed in between the #BEGIN and #END WordPress.
An example of the referral links in my analytics are:
12342920-1.compliance-fred.xyz
buketeg.xyz
bukleteg.xyz
First try:
RewriteEngine On
RewriteCond %{HTTP_REFERER} ^http://[^/]+\.xyz/? [NC,OR]
RewriteCond %{HTTP_REFERER} ^https://[^/]+\.xyz/? [NC,OR]
Rewriterule ^(.*)$ https://www.google.com [r=301,NC]
Second try:
RewriteCond %{HTTP_REFERER} ^http://[^/]+\.xyz/? [NC]
Rewriterule ^(.*)$ https://www.google.com [r=301,NC]
RewriteCond %{HTTP_REFERER} ^https://[^/]+\.xyz/? [NC]
Rewriterule ^(.*)$ https://www.google.com [r=301,NC]
Third try:
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTP_REFERER} ^http://[^/]+\.xyz/? [NC,OR]
RewriteCond %{HTTP_REFERER} ^https://[^/]+\.xyz/? [NC]
Rewriterule ^(.*)$ https://www.google.com [r=301,NC]
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{SERVER_PORT} 80
RewriteRule ^(.*)$ https://www.mydomain.nl/$1 [R=301,L]
</IfModule>
# END WordPress