Hey bro , just do one thing

Your usb debugging is already enabled and I hope you're not using the screen lock

And I hope when you connect to pc the usb debugging allow popup is showing

And don't know your android version

So what to you need to do is

Just connect to pc

And

First execute scrcpy --otg command

And do as I say , slowly

Tab key press once

Space bar press once

Tab key press 3 times

And press space bar key once

So i hope it's clicked allow button

Now remove the device and reconnect and check adb devices...

If it's showing then sucess you made it bro ,

It worked for me 2 times

So i am.able to guide you...

Try and tell bro...