Copy the site to a test subdomain and optimize its code there. Improve the speed of its download.

Before you start, the site is cloned to a test subdomain. It is closed from indexing and all manipulations are done there.

It is necessary to update Word Press, plugins, peripherals to the latest current version in such a way that various integrations (CRM, PBX, etc.) do not fall off.

After that, all customized application forms are transferred to Contact Form 7. So that all requests are correctly and quickly sent to CRM. Come up with some kind of algorithm that would report if any of the forms fall off somewhere.

After that, you need to optimize the program code and remove everything that is not needed. Bring the speed of loading the site to the optimal.