@mohammadrehanseo I am eager to tell you that WordPress speed optimization is my profession. So you may just focus on this list and forget about the rest. You should consider the following:
- HTML caching on the CDN (not only the host)
- Redesign or rethink about the main thread of work (JavaScript execution)
- rearrange the ATF objects and dont lazy load if image or video and don't use web fonts if paragraph or any kind of text.
- Extract the Critical Path CSS style definitions and put it into the head section and request for the rest as a separate external CSS file
- configure asset caching
You may find some other useful tips on WordPress Speed Optimization page on Stack Exchange
