Laravel 6.x to 12 Upgrade

I'm seeking assistance to upgrade my Laravel application from 6.x to 12. We need to ensure compatibility with some third-party libraries.

Key Requirements:
- Use Laravel Shift for the upgrade
- Ensure compatibility of third-party libraries
- Test and verify application functionality post-upgrade

Ideal Skills:
- Strong experience with Laravel upgrades
- Familiarity with Laravel Shift
- Proficient in handling third-party library integrations
- Laravel 12 knowledge is a must

Please provide your experience and approach.