Please follow steps to Increase file upload limit in WordPress:
Step-1: Login to your cPanel account and Click on “Select PHP Version” Icon under the “Software” section. if not finding please search for PHP Version.
Step-2: PHP Selector Extensions will open Now Click on Switch to PHP Options.
Step-3: In the PHP Selector Options, go to the upload_max_filesize and Click on Current limit and choose the new limit you want to set. Now Click Apply and then save.
Step-4: Now Refresh your WordPress admin page and you will see new limit is showing there.