iPad 7 stuck Apple logo blinking

Given your description, your iPad must be restored.

These support pages outline the available methods to restore an iPad - either from a backup, or to Factory Settings:

Restore your iPhone, iPad or iPod touch from a backup – Apple Support

Restore your iPhone, iPad or iPod to factory settings – Apple Support

Restore all content to iPad from a backup - Apple Support

You’ll need access to either a Windows PC (with iTunes for Windows installed) or a Mac (with iTunes or Finder - as appropriate for the installed version of macOS).

Download and use iTunes for Windows – Apple Support

Update to the latest version of iTunes – Apple Support

Use of a PC or Mac computer is unavoidable. If you don’t have access to a suitable computer of your own, that of a helpful friend or family member will suffice. Alternatively, the technicians at the Genius Bar of your local Apple Store or Apple Authorised Service Provider (AASP) will be delighted to assist.

Genius Bar Reservation and Apple Support Options - Apple

yako111 wrote:

I left my ipad 7 on YouTube or Instagram for 30mins, then i found that it has been blinking apple log in white monitor and blank monitor forever now…I did restoring actions by pressing a home button & a top button (I also tried holding volume buttons), but it keeps going back blinking/switching the same blinking. It showed once “support.apple.com/iPad/restore” and a picture of “a laptop and a charger”. I have my iPhone12, but computer to connect…. What can I do?

You'll need a computer to perform recovery mode as outlined here If you forgot your iPad passcode - Apple Support

My ipad was stuckin logo so what is best to do