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Manual method to Migrate SQL Server :-

1. Plan the Migration:
Identify the source and target environments.
Decide on the migration method: backup and restore, detach and attach, or using migration tools.

2. Backup the Source Database:
Perform a full backup of the source database to create a .bak file.

3. Copy the Backup to the Target Server:
Transfer the backup file to the target server using appropriate methods (network copy, external storage, etc.).

4. Restore the Database on the Target Server:
Restore the backup on the target server using SQL Server Management Studio (SSMS) or SQL Server command-line tools.
You might need to adjust file paths or filegroups during the restore process.

5. Transfer Logins and Users:
Transfer SQL Server logins and users from the source to the target server.
Use SQL Server scripts or tools like "Transfer Logins" task in SSMS.

6. Update Connection Strings:
Update connection strings in your applications or services to point to the new SQL Server instance.

7. Test the Migration:
Perform thorough testing to ensure that the migrated database and applications are functioning as expected.

8. Update DNS Records (if applicable):
If you're migrating to a new server with a different hostname, update DNS records or connection information in your applications.

9. Migrate Jobs, SSIS Packages, and Other Components:
If applicable, migrate SQL Server Agent jobs, SSIS packages, and other components to the new server.

10. Monitor and Optimize:
Monitor the new environment for performance issues and optimize configurations as needed.

11. Backup and Cleanup:
Once you're confident that the migration is successful, take a backup of the migrated database on the new server.
Delete the backup files and other temporary files from the migration process.

12. Document the Migration:
Keep a detailed record of the migration process, including any issues faced and solutions implemented.

If your manual method doesn't work to migrate your SQL server then, you can take help of third party tool like Kernel Migrator for SQL Server.
For more information, visit to: https://www.nucleustechnologies.com/sql-migration/