RoseHosting

It depends on what kind of hosting you are using for your WordPress instance. You can ask your hosting provider to check those things for you if possible.

You need to check your WordPress instance permissions. Make sure that you are using the latest supported PHP version, and check its compatibility with your themes and plugins. As a last resort check if the tables of your WordPress database are corrupt and repair them.

Different hosting providers may have different “default” server settings or parameters. You should be checking the system requirements of each plugin and make sure they are active on your server.

For example certain plugin may require a specific PHP version, settings or extensions that are not enabled on your server. In case of your UpdraftPlus plugin it could simply mean that the maximum execution time of your scripts is too low.

If you look through the error or debug logs, you should be able to find more information why your plugin is not working properly. You can then contact your hosting provider and ask them to make the necessary changes on your server as required by your plugins.

You need to change the WordPress address and the site address from HTTP to HTTPS. If the hyperlinks in your WordPress instance have hardcoded HTTP URLs you can install a plug-in like Really Simple SSL that will handle that issue for you.

It is always best practice to restore your WordPress instance from a backup. However you might lose data if you are restoring from older backup.

Have you done some changes to your WordPress instance (installed new plugin, theme, or changed some of the settings)? You might have modified some of the PHP settings on cPanel. If not as suggested above you should contact your hosting provider.

What is the PHP version you are using for this website? If possible, try to change your PHP version (the current recommended version is PHP 7.4)

Disable the sample SSL plugin (append .disabled to the name of the directory of the plugin) and check your SSL certificate. Mostly likely it is server configuration issue related to the SSL certificate.

You should check the browser’s (Web Developer) console (press at same time SHIFT + CTRL + I) for errors.

You can also check the Network tab for more insights.

You need to add the font-size property to your CSS file, for example:
from

#breadcrumbs {
box-sizing: border-box;
max-width: 978px;
width: 100%;
margin: 0 auto;
}

to

#breadcrumbs {
box-sizing: border-box;
max-width: 978px;
width: 100%;
margin: 0;
font-size: 16px;
}

You would want to share the issue with BuddyBoss developer team, they can help you with this, I think.

You would want to ask this in Cloudflare’s forum or ask Cloudflare support, even better.

You would want to ask this in Cloudflare’s forum or contact Cloudflare support, even better.

You should check the wp-config.php file if the database, database connection, user and password configuration is successfully saved

It seems everything is okay here, we can see the same content at the mentioned links.