There are 4 ways that you can choose to increase the maximum upload file size in WordPress.

Update .htaccess file

php_value upload_max_filesize 128M
php_value post_max_size 128M
php_value memory_limit 256M
php_value max_execution_time 300
php_value max_input_time 300

Change the numbers to the values that you need. The max execution time and max input time values are in seconds and might need to be increased further if your internet connection is slow.

Update the php.ini file

To ensure that file uploads work correctly, the post_max_size directive should be a little larger than the upload_max_filesize. For example, the following settings demonstrate how to set a file upload limit to 20 megabytes:

upload_max_filesize = 20M
post_max_size = 21M

Update wp-config.php file

@ini_set( 'upload_max_filesize' , '128M' );
@ini_set( 'post_max_size', '128M');
@ini_set( 'memory_limit', '256M' );
@ini_set( 'max_execution_time', '300' );
@ini_set( 'max_input_time', '300' );

Contact hosting provider

Reach over to the customer support of your hosting provider and ask them to increase these limits for you

Use plugin

Increase Maximum Upload File Size