Joomla 3.x to 5 Upgrade

My Joomla site is currently running on version 3.x and requires an upgrade to version 5. The site is encountering initialization errors and needs updating. The upgrade should maintain all data and the existing content structure. No additional features are needed; just a clean upgrade. The current template and design layout should remain unchanged post-upgrade.

Skills and experience that would be ideal for this job:
- Extensive experience with Joomla
- Proven track record of successful site upgrades
- Strong understanding of data preservation during upgrades
- Ability to troubleshoot initialization errors
- Web design skills for template consistency