Wordpress Migration from IONOS to Hostinger

My Wordpress website is down currently on IONOS. I have SFTP and SSH access, as well as a database backup available. I need the entire site to be migrated to Hostinger, with all design and functionality remaining the same. In addition to the website, all my email accounts need to be migrated as well.

Ideal skills and experience for the job:
- Expertise in Wordpress migration
- Experience with Hostinger and IONOS
- Email migration skills
- SSL setup capabilities

All tasks must be completed while keeping the current design and functionality of the website unchanged.