Development of managerial skills for administrative assistant

i am working in a stable organization from 15 years ago ( Egyptair Airlines ) as a planning specialist in safety, quality and standardization general department. and i have a lot of experience in the following issues:

-Document control

-administrative skills

-Microsoft excel

-Microsoft word

-Microsoft access

-Microsoft power-point

-PDF Editing

-PDF converting

-social media

-customer services

-research and development

-forms creations

-data entry

-data entry interface designing

-crystal reports

-e-mails

-flyers designing

-documents compare

-evaluation and follow up of employees performance and reports

-managerial skills for administrative assistance