Hey Wodyoh,
I see that the frequently used emojis are not updating. I'll be happy to help out.
You mentioned that you reset the keyboard. Just to confirm, you removed the keyboard and added it again? If not, try that now by going to Settings > General > Keyboards > Keyboards, then swipe to delete the Emoji Keyboard. Restart the iPhone then go back to the previous settings and instead tap "Add New Keyboard" to add the Emoji Keyboard back to the device. More info here: About the keyboards settings on your iPhone, iPad, and iPod touch - Apple Support.
Make sure the iPhone is updated: Update your iPhone, iPad, or iPod touch
If the frequently used section of the Emoji keyboard is still not working, try reinstalling the iOS. Before you proceed, please back up your data using the steps below. Reinstalling the iOS only overwrites the iOS on the device, and does not affect personal data, but it’s always recommended to have a backup first: How to back up your iPhone, iPad, and iPod touch.
Once you've verified that your backup is current, follow the steps below to reinstall iOS on your iPhone. Keep in mind that this article was written for a different issue, but these steps will still be helpful. Also be aware, you'll want to click the "Update" button and not the "Restore" button when prompted as the "Restore" button will restore the device to factory settings: If your iPhone, iPad, or iPod touch won't turn on or is frozen.
Keep us updated!