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Sure, I can simplify that answer.
Basically, it’s not uncommon to experience discrepancies when transitioning from Universal Analytics (UA) to Google Analytics 4 (GA4). There can be a lot of reasons for those differences, such as small changes in how the two systems define things like users and events.
That being said, the difference in user count you’re seeing does seem a bit extreme. To get to the root of it, you should first make sure that aren’t any issues with how you’ve set up GA4. There are some links to basic debugging guides for GA4 in your answer.
Once you’ve checked for any setup issues, the next step is to compare the events that get recorded when you access your site to what’s being shown in Analytics. You can do this by taking screenshots of your Analytics reports (make sure to include the date ranges), and of the events that are fired when you perform a typical pageview on your site.
Once you’ve gathered this information, you should have a better idea of what’s causing the discrepancy.
