How to write a believable CV?
You need to focus your CV on the specific department and specialty you are interested in.

First, look at some programs of study.  Look at the research interests.  Look at some of the published papers.  Think about which of your many areas within IT you would like to delve into more deeply; think about which areas interest you the most for working in when you are done with this next degree.

Once you've identified some programs that YOU are excited about, pick and choose which items in your full CV you'd like to emphasize in your application.

Try to get some feedback from a couple people whose opinion you trust, about your draft CV and application.

You absolutely need at least one strong letter of recommendation -- so figuring out who could write this is going to be important.

I apologize, I don't know the specific differences between the European context and the U.S., but hopefully this answer, written by someone who knows the U.S. system best, will still by helpful.