I am using cPanel of my website to increase maximum upload file size for wordpress media uploads. I have used the codes(found out from google) for this purpose wp-config.php
Unfortunately, this is something you will have to ask you provider to do.
If your the owner of the server and can login to WHM it's under:
Tweak Settings => PHP Settings => Maximum Upload Size
Newer version have it listed under:
Home => Service Configuration => PHP Configuration Editor => Tweak Settings => PHP