Laravel - How to load updated database connection information from .env file?

I am trying to write an installer-type app using Laravel 10. Where the purpose is: if I don't set the database information it will redirect me to the setup database. When I fill up the form and submit, it performs the following task:

1. Update database-related content in the .env file
2. Clear cache, config, and finally cache new config using the Artisan call.
3. Finally migrate the database still using the Artisan call.

Although the .env file content is updated, it still uses the last database-related info that existed before the update. I mean, suppose previously DB name was ab_setup, then I update it to nn_setup, .env file shows the DB name as nn_setup, but the browser responds:

>Unknown database ab_setup (Connection: mysql, SQL: select * from information_schema.tables where table_schema = nn_setup and table_name = migrations and table_type = 'BASE TABLE').

I have no idea what's actually wrong. Here is my code:

// Update .env file content
$envContent = [
    'DB_CONNECTION' =>  $request->database_connection,
    'DB_HOST'       =>  $request->database_host,
    'DB_PORT'       =>  $request->database_port,
    'DB_DATABASE'   =>  $request->database_name,
    'DB_USERNAME'   =>  $request->database_username,
    'DB_PASSWORD'   =>  $request->database_password
];

foreach( $envContent as $key => $value ) {
    $this->replace_env_value($key, $value);
}

// Clear Cache and Config & Cache new Config
Artisan::call('cache:clear');
Artisan::call('config:clear');
Artisan::call('config:cache');

// Migrate DB and Seed
Artisan::call('migrate');
Artisan::call('db:seed');

// Create Admin User
$user = new User();
$user->name = $request->admin_name;
$user->email = $request->admin_username;
$user->password = Hash::make($request->admin_password);
$user->save();

Does anyone have the idea what I miss that will fix the issue?

You should reconnect the database manually.
Reference here.

Also, you need to remove cache before with DB:purge() method