HTACCESS and ROBOTS For Root Blog and Subdomain Blogs

Hello,
I have wordpress installed in root ynotdo.com

and have many subdomains example1.ynotdo.com, example2.ynotdo.com…

I have the same .HTACCESS and ROBOTS.txt file in each directory. Root and all subdomains.
Recently I have been getting lower traffic at my blogs so I was wondering if I made a mistake somewhere.
Is there anything wrong with these and does it look ok?

Should I use the same files in root and subdomains?

Please help me to make it better.

I don’t know if it’s bad for affiliate links ( adsense, cj….)

This is .htaccess file that I am using:

ErrorDocument 404 /index.php
ErrorDocument 400 /index.php
ErrorDocument 403 /index.php
ErrorDocument 500 /index.php
ErrorDocument 401 /index.php

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

<files .htaccess>
order allow,deny
deny from all
</files>

ServerSignature Off

<files wp-config.php>
order allow,deny
deny from all
</files>

<Files install.php>
Order Allow,Deny
Deny from all
Satisfy all
</Files>

<files readme.html>
Order deny,allow
deny from all
</files>

<IfModule mod_rewrite.c>
RewriteEngine On
# If subdomain www exists, remove it first
RewriteCond %{HTTP_HOST} ^www.([^.]+.[^.]+)$ [NC]
RewriteRule ^(.*)$ http://%1/$1 [R=301,L]
</IfModule>

# If requested resource does not exist as a file
RewriteCond %{REQUEST_FILENAME} !-f
# and does not end with a period followed by a filetype
RewriteCond %{REQUEST_URI} !..+$
# and does not end with a slash
RewriteCond %{REQUEST_URI} !/$
# then add a trailing slash and redirect
RewriteRule (.*) $1/ [R=301,L]

RewriteEngine On
RewriteCond %{QUERY_STRING} (\<|%3C).*script.*(\>|%3E) [NC,OR]
RewriteCond %{QUERY_STRING} GLOBALS(=|\[|\%[0-9A-Z]{0,2}) [OR]
RewriteCond %{QUERY_STRING} _REQUEST(=|\[|\%[0-9A-Z]{0,2})
RewriteRule ^(.*)$ index.php [F,L]
</IfModule>

Options All -Indexes

Robots.txt file:

User-agent: *
Disallow: /cgi-bin
Disallow: /wp-admin
Disallow: /wp-includes
Disallow: /wp-content
Disallow: /author
Disallow: /wget/
Disallow: /httpd/
Disallow: /i/
Disallow: /f/
Disallow: /t/
Disallow: /c/
Disallow: /j/

User-agent: Mediapartners-Google
Allow: /

User-agent: Adsbot-Google
Allow: /

User-agent: Googlebot-Image
Allow: /

User-agent: Googlebot-Mobile
Allow: /

User-agent: ia_archiver-web.archive.org
Disallow: /