Is your wp-admin working, but the front-end is white page?
This usually happens when a certain WordPress plugin is running up against the PHP Memory Limit.
Check your error_log file for any error messages that confirm this:
[Mon Aug 18 17:36:30 2021] [error] [client 123.45.67.89] PHP Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 7680 bytes) in /var/www/index.php on line 18
Edit the file /etc/php7/apache2/php.ini
and increase the memory limit:
; Maximum amount of memory a script may consume (128MB)
; http://php.net/memory-limit
memory_limit = 128M
Increase the limit and then restart Apache.
service apache2 restart
I also suggest that you should audit your plugins to see what’s using the memory.
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