Sorry, but it’s impossible to predict how, or if, the effects of the sustained damage will worsen. I would council against deliberate impacts to the back of the iPad - per your previous indication of attempts to improve matters - as doing so may make the fault considerably worse.
If you haven’t already done so, if you intend to continue use of the iPad and have assurance of your local data remaining accessible in the event of total failure - you would be well advised to enable iCloud backups of your iPad. Should the iPad fail, you data can be restored to a replacement iPad.
Settings > [Your Name / AppleID] > iCloud > iCloud Backup - set to ON