Use Past Experiences to Boost Your Credibility
Mentioning your past work at a renowned brand like IBM gives you an edge. It's like a stamp of approval for your skills and knowledge.
Showcase Your Speciality
While being a jack-of-all-trades is good, emphasizing your specialties, such as Active Directory and Network Security, can be beneficial. It hints at your depth of knowledge in these areas, and could attract employers looking for these specific skills.
Repetition for Emphasis
Reiterating your job title at the beginning of your headline, as done here, can be strategic. It reinforces your professional identity and could boost your visibility in LinkedIn searches for System Administrators.