Попробуй так:
RewriteCond %{HTTP_HOST} ^[URL=http://www.sait.ru]www.sait.ru[/URL]
RewriteRule ^(.*)$ [URL=https://sait.ru/$1]https://sait.ru/$1[/URL] [R=301,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_URI} !\..+$
RewriteCond %{REQUEST_URI} !/$
RewriteRule (.*) [URL=https://sait.ru/$1/]https://sait.ru/$1/[/URL] [R=301,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-l
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !/bitrix/urlrewrite.php$
RewriteRule ^(.*)$ /bitrix/urlrewrite.php [L]
RewriteRule .* - [E=REMOTE_USER:%{HTTP:Authorization}]
RewriteCond %{REQUEST_URI} ^(.*)/$
RewriteRule .* - [L]
RewriteCond %{ENV:REDIRECT_STATUS} 200
RewriteRule .* - [L]
RewriteCond %{REQUEST_METHOD} =GET
RewriteCond %{REQUEST_URI} ^(.*)/index.php$
RewriteRule ^(.*)$ %1/ [R=301,L]
RewriteCond %{HTTP_HOST} ^[URL=http://www.sait.ru]www.sait.ru[/URL]
RewriteRule ^(.*)$ [URL=https://sait.ru/$1]https://sait.ru/$1[/URL] [R=301,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_URI} !\..+$
RewriteCond %{REQUEST_URI} !/$
RewriteRule (.*) [URL=https://sait.ru/$1/]https://sait.ru/$1/[/URL] [R=301,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-l
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !/bitrix/urlrewrite.php$
RewriteRule ^(.*)$ /bitrix/urlrewrite.php [L]
RewriteRule .* - [E=REMOTE_USER:%{HTTP:Authorization}]
RewriteCond %{REQUEST_URI} ^(.*)/$
RewriteRule .* - [L]
RewriteCond %{ENV:REDIRECT_STATUS} 200
RewriteRule .* - [L]
RewriteCond %{REQUEST_METHOD} =GET
RewriteCond %{REQUEST_URI} ^(.*)/index.php$
RewriteRule ^(.*)$ %1/ [R=301,L]