I Have lost Play store keystore jks - want to update my app in play store

I am looking for a developer to help me update my app in the Play Store. Unfortunately, I have lost my keystore file and do not have a backup. I am not sure if my app is signed with an upload key or an app signing key. The current version of my app is less than 1.0.

Skills and Experience:
- Experience with Play Store app updates and keystore files
- Knowledge of app signing keys and upload keys
- Ability to troubleshoot and recover lost keystore files
- Familiarity with the Play Store submission process
- Attention to detail and ability to ensure a smooth update process