My webpage taking too much time while reload

I have three websites that i hosted in a shared hosting. The websites are loading fast in first time. But when you trying to reload the page, it took up to 40 seconds. I reinstalled databases, themes, plugins, i deleted the whole site and reinstalled again but nothing changed. Also i tried different browsers, did some pagespeed and gtmetrix analysis but its still sucks when i reload. I opened a ticket to hosting provider and they said there's nothing wrong with our servers. I'm using LiteSpeed server with PHP 7.2. There's a lot of system resources so theres nothing wrong about it. As a newbie, what could be the problem?

Here's my website https://yazilimcilarinmolayeri.com

Note: if i did any English mistakes, please forgive me. I'm from Turkey.