Hi @dabararyan,
Thanks for using Bitnami. I visited your website and it looks like the SSL certificate is fine. What I see in your bnsupport bundle is that you are running out of memory
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Display amount of free and used memory in the system
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Running: free -m
In: /opt/bitnami
Output:
total used free shared buff/cache available
Mem: 482 275 9 32 197 162
Swap: 634 32 602
According to it, you are using a small server of only 512 MB of RAM. We recommend using a server with at least 700 MB of free memory
https://docs.bitnami.com/aws/faq/administration/change-server-type/
Additionally, I found several error messages related to PageSpeed on your Apache logs. You can check our guide on this and disable it if needed
https://docs.bitnami.com/aws/apps/wordpress/administration/use-pagespeed/