Hello how are you? In fact your current server settings are low for multiple access and can overload the network/hardware resources, about to leave the entire site slow when there are many simultaneous accesses. In case you are interested, I offer complete hosting on servers optimized for high performance, for only $ 10 per month.
The server has 30 GB of RAM and 6 CPU's. The $ 10 plan, you will have 30 GB of disk space with unlimited emails, access via CPANEL/FTP.
The server also has internal cache and the PageSpeed module to optimize the entire site automatically.
I can do a full migration from your current site, without charge, for you to check the result. (without changing anything in your current site, I will use a temporary domain for testing). I guarantee you'll be satisfied and the site will work in the maximum performance possible.
We can start right now!
Best regards,
Jonatas