Session tracking Issue | 100% bounce Rate | Google Analytics

I am also having analytics issue. The issue i am facing it that, my bounce rate is now 100%. This is faulty because, in GA when a user moves from one page to another before 1 minute on screen time, the same particular user becomes a new user…
There is no user flow history and all of the traffic is now piling up in direct source.

To give you a pretext, we are using Universal Analytics. When this issue came, I presumed there is an issue with google analytics, so i created a new property of GA4 and added its code using tag manager. But the issue still exists. please help.

Here is my site Read-Only: LINK
(how to share your site Read-Only link)