Hi @Swapnil Solanki ,
While we do not officially support MariaDB as a source in SSMA, I've heard success stories with SSMA for MySQL being used for this purpose. In fact, we found MariaDB ODBC driver to work way better with MySQL, then official MySQL ODBC driver.
I would suggest you to try SSMA for MySQL to migrate your MariaDB database: https://aka.ms/ssmaformysql.
Regards,
Alex.