I have lost my keystore file now i need to update my app on play store is there any way to get my keystore file i have my old signed apk p
You cannot recover a lost keystore.
The signature on your existing APK is just a signature- you cannot reproduce the signature without the key that generated the signature.
Google does not store, keep track of, or ever have access to your keystore. It is completely on the developer to manage the keystore.
Your options are: