How can I troubleshoot a website that is migrated to a new server with all white front-end pages and an accessible back-end?

Migrated a WordPress website from the original web host to a new server (PHP version and MySQL version are different). After the database and files are imported, the back-end can be logged in normally, but the front-end page is completely white, nothing is displayed, and there is no error message.

What should I do to troubleshoot step by step to find the cause?

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