You can try to do a wipe cache partition, for that shut your device off, then press and hold power and volume up buttons until you see Android Logo. If done correctly, you'll access the recovery mode where you'll navigate with the volume buttons and confirm with power button. Use the volume down button to reach "wipe cache partition" and use power button to choose it. When the wipe cache partition will be ended, choose "reboot system now" to reboot your device and see if your phone is faster.
Try to boot into safe mode, it won't let third party apps working, if the phone seems faster, it will mean that a third party app is causing the lags. To boot into safe mode, when you'll be going to click on switch off, press it and hold it, you'll have a green button which's named "safe mode". Click on it. To exit safe mode, just do a normal reboot
I don't know, sorry... but maybe. On my A53 5g, the only time when it becomes slower after unlocking is when I shut off the device then I turn it back on. That's why I have asked when do you face the issue
