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    In htaccess you can set

php_value memory_limit '1024M'

Keep in mind, this only works, if you server configuration allowes "AllowOverride" directive for this directory.

And set it back to php7.4 if it ran before leave it.  1 vCPU is a bit slim, could be the bottleneck. 
I'm not a friend og IONOS.

    In htaccess you can set

php_value memory_limit 1024M'

Keep in mind, this only works, if you server configuration allowes "AllowOverride" directive for this directory.

And set it back to php7.4 if it ran before leave it.  1 vCPU is a bit slim, could be the bottleneck. 
I'm not a friend og IONOS.