You were doing a functional resume since your breadth of different jobs was limited.
But now that you have greater experience, focus on that. Trim off all the individual job duties, and reorder them in order of importance. Leave out lines that don’t really say anything to an outsider, like “coordinated with vendors and with company personnel in order to facilitate purchases.” To my eye, if I was looking over your application as someone looking to fill a position, my first reaction is “this guy is trying to fill space to make himself look more impressive than he actually is” because you’re listing things that simply come with the territory of the job.
Your help desk job should really be boiled down to maybe 3 or 4 lines and focus on any projects or value-add you’ve provided while performing that duty. A list of job duties isn’t really saying much, apart from “I worked help desk doing typical help-desky things.” It doesn’t stand out. If you were the help desk lead, focus on the leadership aspects of the job, not the day-to-day create accounts, reset passwords kind of entry-level stuff.
Talk about how you did certain things, not what you did. For example:
“Planned, coordinated, and implemented network security measures in order to protect data, software, and hardware”
How? What tools did you use? What were these measures? Talk in specifics, leaving out the obvious like “data software hardware” (any IT person knows this already). What was your role in this? Was it as a project leader or as a mere pair of hands doing what someone else above you told you to do?
“Tracked, maintained, and inventoried over $3 million worth of digital systems, including a variety of routers, switches, radios, servers, and computers.”
How? What software did you use? What was the impact of this initiative? Did you create this system to fill a need, or were you handed this existing responsibility that someone else designed?
“In charge of network performance utilization, security monitoring and server maintenance.”
What does this mean? This is a weak line because it’s not using an action verb. It’s also probably not necessary, as it’s like the help desk role and just mentioning a daily task.
“Reviewed service contracts for seven locations and was able to reduce cost $40,000 annually.”
By doing what? How? Service contracts for what?
Bear in mind that these are all rhetorical questions. I’m not posting them to get your answers, but rather, to get your wheels spinning on how to rewrite some of those entries. Pick out the significant highlights of your work history, something that says “none of this would have happened without me.”
Include more white-space so that it doesn’t look tiring to read. I had to struggle to read each line, so if I was inundated with other applications and resumes, I wouldn’t have given yours the time that I did just now.