Turn off Battery saver from Security app > Battery. If that not fix the problem:
Turn off restrictions for background data from Settings > Battery.
Some apps even after changes above still not received a notifications.
Last step (if needed) is to turn off miui optimization and set memory...
Try to update to 6.2.25 via Updater first. This version must flash TWRP automatically. First boot will take some time. Then you can update to latest version as usual.
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Pinch with two fingers on home screen, tap on widgets, slide left till find Google icon, tap on it and choose right widget.
Other option is long press home button: opens Google now and voice search is on the top.
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Well I don't have the device. Maybe you can try to rename multilang rom "update.zip" and flash from recovery. Of course I'm not sure about that.
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So try to turn off Wi-Fi once for couple hours and check the consumption.
Also you can repeat to find the cause via BetterBatteryStats:
Fully charge the battery and monitor the Deep Sleep time of the device (see first screenshot).
If you see that phone is not going to Deep Sleep, you must find...