.htaccess redirect to same subfolder - wordpress

Question

My problem is the following: My company shares hosting with others, and we have the subdomain inside a "public_html" folder. I can enter the index of my page perfectly, that is in www.principal.com/mypage it enters perfectly.
The problem is when I redirect to pages within my subdomain, they redirect to the 404 Not Found of the main page, that is to say www.principal.com/mypage/new 404 Not Found page of principal.com
The main / public_html / .htaccess file is
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . index.php [L]
</IfModule>
The file public_html/mypage/.htaccess is
<FilesMatch ".(phtml|php|PhP|php5|suspected)$">
Order Allow,Deny
Allow from all
</FilesMatch>
The file public_html/mypage/public/.htaccess is
<IfModule mod_rewrite.c>
<IfModule mod_negotiation.c>
Options -MultiViews
</IfModule>
RewriteEngine On
# Redirect Trailing Slashes If Not A Folder...
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)/$ /$1 [L,R=301]
# Handle Front Controller...
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^ index.php [L]
# Handle Authorization Header
RewriteCond %{HTTP:Authorization} .
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
</IfModule>
I must clarify that my subdomain worked perfectly until a few days ago, since March that it worked very well.
Wordpress is the main page of the domain, my page in the subdomain is with the Laravel framework.
So, I redirect from Laravel to Laravel whit
Route::group([
'middleware' => 'auth'],
function(){
Route::get('/onepage', 'HomeController#one');
Route::get('/twopage', 'HomeController#two');
});

Answer 1

Your problem is because the directives in the root level .htaccess are used even something might be directed to the site in the subfolder. Try something like this in public_html/.htaccess, to exclude requests sent to the subfoler:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index.php$ - [L]
RewriteCond %{REQUEST_URI} !^/autorizaciones/.*
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . index.php [L]
</IfModule>

Answer 2

I solved it
I changed The file public_html/mypage/.htaccess is
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /MYPAGE
RewriteRule ^index.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . index.php [L]
</IfModule>