I use an app every morning.
But the app didn't show on suggest apps list.
Yes, suggested apps list should show the apps which are frequently used but instead it shows the 5 apps which are recently used.
It will be better if there is an option to select if we want the apps suggestion based on the frequency of app usage or only the 5 most recently used apps.
We haven't changed google code when it comes to app suggestions. The only thing you can do is to turn it on and off. In the app drawer, press the three dot menu in the top right corner -> preferences -> Home screen -> toggle Suggest apps. I believe this might reset it. I understand this is not what you asked but this is how Google designed it.