Please help us help you and fill where relevant:
LimeSurvey version: [5.4.11]
Own server or LimeSurvey Cloud: Own server
Survey theme/template:
==================Hello,We are currently running LimeSurvey 5.4.11 on an Ubuntu server and are planning to upgrade to version 7.9.0.We would appreciate your guidance on the following questions:

1. Is it possible to upgrade directly from LimeSurvey 5.4.11 to 7.9.0?
2. What PHP version is recommended for this upgrade?
3. Are there any specific considerations or risks regarding the preservation of existing surveys, responses, and configurations?

Thank you in advance for your assistance.Best regards.