Can Server OS break my site

I recently had Bluehost update the server OS on our site. (CENTOS 7.7 kvm [server] v86.0.18 Load Averages: 0.04 0.11 0.13) In addition, the site was hacked and banned by Google. I cleaned the site and got it cleared by Google.

Still, I am having a myriad of issues.

1) I received an email today from WordPress saying that LearnPress, a plugin that I have been using for over 3 years, has apparently broken the site. I disabled the plugin and renamed the folder on the server.

Text of the email: When seeking help with this issue, you may be asked for some of the following information:
WordPress version 5.4
Current theme: Children Charity Child (version 1.0.0)
Current plugin: LearnPress (version 3.2.6.7)
PHP version 7.4.2

Error Details
=============
An error of type E_ERROR was caused in line 1225 of the file /home/doublear/public_html/wp-content/plugins/learnpress/inc/curds/class-lp-user-curd.php. Error message: Allowed memory size of 41943040 bytes exhausted (tried to allocate 20480 bytes)

2) When I log into the admin panel, pages either come up blank or I receive this error: (There has been a critical error on your website. Please check your site admin email inbox for instructions.) If I refresh the page it will (usually) come up.

I am diligent about updating plugins. It doesn’t seem that these are related. But I have no clue.