First edit your wp-config.php and put this code somewhere in it:
If it didn’t work, put a file named php.ini in your website root directory and put this code in it. If the file already exist, insert the code in it.
memory_limit = 128M;
If none of the above methods work, contact your web host and ask them to increase the memory limit for you.
I hope that helps.
Sometimes we make a fix and we think that the issue is resolved but it will happen again on the reviewer side because of different configuration/content.
Make sure that your issue is resolved then you should mention what you’ve done in “Message to Reviewer” section.
Hope that helps.